Comparison of depression and anxiety between HIV-negative men who have sex with men and women (MSMW) and men who have sex with men only (MSMO): a cross-sectional study in Western China.

OBJECTIVE: To compare the prevalence of depression, anxiety and comorbidity between HIV-negative men who have sex with men and women (MSMW) and men who have sex with men only (MSMO) and examine the associated factors with depression and anxiety separately.
DESIGN: A cross-sectional study.
SETTING: The study was conducted in Western China. PARTICIPANTS: From April 2013 to October 2014, 2422 participants aged 18-65 years, who were male at birth, had engaged in sex with male partners in the past 6 months, self-reported negative or unknown HIV status, were willing to participate and provided informed consent were recruited using non-probability sampling. An anonymous self-administered questionnaire was used to collect the data. A total of 1809 HIV-negative men who have sex with men (MSM) were eligible for the final analysis.
RESULTS: Of 1809 MSM, 16.1% were MSMW and 83.9% were MSMO. The prevalence of depression, anxiety and comorbidity was 50.86%, 36.43% and 32.65%, respectively, for MSMW; these results were higher than those for MSMO (35.18%, 23.52% and 18.91%, respectively). After adjusting for potential confounding factors, the prevalence of depression and anxiety was higher among MSMW than among MSMO. The prevalence of depression and/or anxiety was associated with young age, lower educational level, lower monthly income, lower HIV score and some risky sexual behaviour (had never engaged in HIV counselling, had obtained commercial sexual services in the past 6 months and sometimes/always looked for sexual partners through the internet). The prevalence of depression and anxiety was lower for those who drank less than once a week than for those who never drank.
CONCLUSION: Our findings suggest the need to address mental health among MSMW. Future health intervention strategies should integrate mental health services and traditional HIV prevention programmes and should consider the differences between MSMW and MSMO. TRIAL REGISTRATION NUMBER: ChiCTR-TRC-13003849; Pre-results. © Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

RCT Entities:   Population Interventions Outcomes

This study is based on a large sample of men who have sex with men in Western China (n=1809).

Depression and anxiety were assessed using validated scales (The Center for Epidemiological Studies Depression Scale and the Self-Rating Anxiety Scale).

However, the cross-sectional study design limits causal inferences.

In addition to the serological status of HIV, other information was self-reported and the results for some sensitive issues may therefore be biased.

Introduction

In 2015, men who have sex with men (MSM) accounted for 12% of new HIV infections globally.1 In China, MSM are at higher risk for new HIV infections, with the number of new HIV infections increasing from 487 (2.5%) in 2006 to 34 358 (25.5%) in 2017 despite the wide variety of interventions that have been employed.2 3

Studies have shown that adverse mental health, such as depression and anxiety, is associated with HIV risk among MSM.4–8 For instance, MSM who report high levels of depressive symptoms are more likely to engage in condomless anal sex,9 10 and anxiety has been identified as an independent predictor of sexual risk.11 Beyond HIV risk, depression or anxiety is also related to other adverse health outcomes such as low adherence to antiretroviral therapy,12 suicidal thoughts13–15 and some lifelong chronic diseases.16 Moreover, comorbidity of depression and anxiety is very common and has been reported in many studies,17–19 and this comorbidity can increase the severity and course of an injury. Although many studies have investigated mental health among MSM, little research has focused on the differences between men who have sex with men and women (MSMW) and men who have sex with men only (MSMO).

It is necessary and important to distinguish MSMW from MSM, especially in China. Because marriage between males is illegal, and due to the prevalence of the traditional Chinese value of ‘having a son to carry on the family name’, many MSM must eventually marry and have sex with women, leading to a relatively high proportion of MSMW in China. One study conducted in Beijing, the capital city of China, reported that of 1141 MSM, 45.6% were MSMW and marriage was a strong predictor of being in this group.20 Hence, we hypothesise that the environment in which MSMW and MSMO live and the experiences they have may differ, which may contribute to different levels of mental health.

Some studies have found differences between MSMW and MSMO in HIV-related risky sexual behaviour (eg, unprotected anal sex and unprotected oral sex) and HIV testing,21 22 but few studies have focused on the different levels of mental health between MSMW and MSMO. When MSM are grouped based on self-identified sexual orientation (gay or bisexual), the prevalence of depression is inconsistent. In a survey involving 1367 MSM in Mexico, the prevalence of depression was lower in bisexuals than in gay individuals.23 However, Jorm et al 24 obtained the opposite findings, and Millar et al 25 did not find an association. Some self-identified gay men may still have sex with women, especially in China. Dyer et al 26 found that 75% of MSMO identified themselves as gay while 72% of MSMW identified themselves as bisexual, suggesting that self-identified sexual orientation is not consistent with actual sexual behaviour (MSMW or MSMO). We consider a classification based on actual sexual behaviour more realistic.

Another point that should be noted is that some studies have targeted the HIV-positive (HP) MSM population to explore their mental health,27 28 while others have not distinguished HP MSM from HIV-negative (HN) MSM populations.15 29 The levels of mental health in these two MSM populations with different HIV serological status may be different. Considering these conditions, we targeted only the HN MSM population in this study. In this study, we (1) compare the prevalence of depression, anxiety and comorbidity between HN MSMW and HN MSMO and (2) examine the associated factors for depression and anxiety separately for MSM.

Methods

Participants and procedures

This study was a cross-sectional analysis of an open, randomised, multicentre, parallel controlled clinical intervention trial conducted in Western China to evaluate HIV pre-exposure prophylaxis. From April 2013 to October 2014, a total of 2422 participants were recruited using non-probability sampling in Chongqing (Chongqing City, Wanzhou District), Sichuan (Mianyang, Nanchong, Suining, Yibin and Luzhou cities), Xinjiang (Wulumuqi and Yili cities) and Guangxi (Nanning, Liuzhou and Beihai cities) in Western China. Specifically, we advertised on gay websites and in QQ groups and we cooperated with local non-governmental organisations that provide information about HIV prevention, counselling and testing for lesbian, gay, bisexual and transgender individuals in each site. We followed this approach to introduce detailed information (purpose, process, potential benefits and risks) about this study to the leaders to gain their support and, with their assistance, to recruit participants from the organisations. The participants were also encouraged to invite their friends who met the criteria. Participants aged 18–65 years, who were male at birth, had engaged in sex with male partners in the past 6 months, self-reported negative or unknown HIV status, were willing to participate and provided informed consent were recruited.

After informed consent was obtained, an anonymous self-administered questionnaire was used to collect the data. If the participants encountered any unclear terms, the trained investigator explained the terms to them. All questionnaires were then checked for both completeness and consistency. After completing the survey, the participants’ HIV serological status was determined by HIV serological tests. First, antigens and antibodies were screened with the fourth-generation ELISA from Beijing Kewei Clinical Diagnostic Reagent. If the test was positive, the specimens were retested using the HIV 1+2 antibody diagnostic kit (Electroselenium method). If the result of the retest was positive, an HP result was reported. Each participant was compensated ¥80 for transportation and breakfast.

Patient and public involvement

No patients were involved in the design, recruitment and conduct of this study. An anonymous questionnaire was used to collect data. All participants agreed the results of the study will be published in the form of articles with no personal information.

Measures

Definitions of MSMW and MSMO

All participants were asked to provide the number of their male partners in the past 6 months, including regular partners and casual partners, and the number of their female sexual partners in the past 6 months. If the number of female sexual partners was 0, the participant was considered to be part of the MSMO group, while a number greater than 0 indicated that the participant was in the MSMW group in this study.

Demographic characteristics

Demographic characteristics included age, household registration, educational level, marital status and average monthly income.

HIV-related characteristics

A variety of characteristics related to HIV were assessed, including HIV knowledge scores, which consisted of 13 items relating to the transmission and infection of HIV. Scores greater than or equal to 11 were considered to reflect a better understanding of HIV knowledge based on the criteria that a correct answer received a score of 1 point, while a wrong answer or ‘don’t know’ answer received a score of 0. The participants were asked about HIV testing and HIV counselling (have you ever engaged in HIV testing and counselling), their perception of HIV severity, their perception of the rates of HIV infection among MSM in the city where they lived and their perception of the threat of HIV to themselves and their families. The participants were also asked about their sexual role (only ‘1’, both ‘1’ and ‘0’, only ‘0’), whether they had unprotected anal and oral sex with male partners in the past month, whether they had looked for sexual partners through the internet, whether they had obtained commercial sexual services, and whether they had been diagnosed with a sexually transmitted disease (STD) by doctors in the past 6 months.

Substance use

Substance use included the use of alcohol and illicit drugs. The participants were asked about their frequency of drinking. The responses ranged from ‘never’ to ‘almost every day’ in the last month.

Illicit drug use was assessed by asking the participants whether they had used drugs (ecstasy, methamphetamine, ketamine, opium, cannabis, heroin, pethidine, morphine and other illicit drugs) in the past 6 months. Participants who reported using any one of these drugs were classified as ‘yes’.

Depression

Depression was evaluated using the Center for Epidemiological Studies Depression Scale,30 which is used primarily in epidemiological investigations to screen out participants with depression for further diagnosis. Many studies have demonstrated the reliability and validity of the scale.31–33 The scale consists of 20 items, and the participants were asked to give scores of 0 (occasionally or no) to 3 (most of the time) for each item based on how frequently they experienced the corresponding feeling in the past week (eg, ‘I felt that I was struggling with everything’ and ‘I felt lonely’). Of these items, four were scored in reverse order (3 to 0), and the scores for the 20 items were aggregated. Scores equal to or greater than 16 points indicated the likely presence of clinical depression, and higher scores indicated greater levels of depressive symptoms. The standardised Cronbach’s α in this study was 0.87.

Anxiety

Anxiety was measured using the Self-Rating Anxiety Scale34 and studies have shown the substantial reliability and validity of this scale.35 The scale consists of 20 items scored on a four-point scale ranging from 1 (no or very little time) to 4 (most or all the time) according to the frequency of the respondent’s personal experience (eg, ‘I felt scared for no reason’, ‘I felt likely to be mad’) in the past week. Of these items, five were reverse scored. The scores for the 20 items were aggregated into a raw score, and a standard score was obtained by multiplying the raw score by 1.25 and then taking the integer. Scores equal to or greater than 50 indicated anxiety and higher scores indicated greater levels of anxiety symptoms. The standardised Cronbach’s α in this study was 0.86.

Statistical analysis

Differences in demographic and HIV-related characteristics between the MSMW and MSMO were analysed using the χ2 test or rank-sum test. Scores for depression and anxiety were reported using the mean±SD, median and range. Comparisons of the scores between the MSMW and MSMO were performed using the rank-sum test, while comparisons between the MSMW and MSMO regarding the prevalence of depression, anxiety and comorbidity were performed using the χ2 test. The variables were screened using stepwise regression in multivariate logistic regression analysis. P<0.05 was considered statistically significant. All statistical analyses were performed using SAS V.9.4 software.

Results

From April 2013 to October 2014, 2422 participants were recruited in Chongqing, Sichuan, Guangxi and Xinjiang. In total, 613 MSM were excluded due to the reasons shown in figure 1. Among the eligible sample of 1809 MSM, 1518 (83.9%) were classified as MSMO, and 291 (16.1%) were classified as MSMW according to the number of female sexual partners in the past 6 months they reported.

Figure 1

Flow chart of participants’ enrolments. MSMO, men who have sex with men only; MSMW, men who have sex with men and women.

The demographic characteristics, HIV-related characteristics and substance use rates of the MSMO and MSMW are shown in table 1. The median age of the MSMO group was 27 years (IQR: 23–33) compared with 34 years (IQR: 27–40) for the MSMW group. Univariate analyses indicated that MSMW were more likely than MSMO to be married, be part of rural households, have a lower HIV knowledge score, perceive a higher AIDS threat to themselves and their families and engage in less unprotected oral sex with their male partners in the past month. After adjusting for demographic and HIV-related characteristics, these differences persisted and were statistically significant (p<0.05). MSMW were also likely to be older, have a lower education level and have been diagnosed with an STD by doctors in the past 6 months and were less likely to report ever having HIV testing and counselling than MSMO. Although the direction of these associations remained after adjusting for demographic and HIV-related characteristics, the associations were no longer statistically significant.

Table 1

Demographics, HIV-related characteristics, substance use between MSMW and MSMO

Variable	MSMO (n=1518)	MSMW (n=291)	P value	Multivariate analysis
	n (%)	n (%)		Adjusted OR (95% CI)	P value
Age			<0.01*
18–25 years old	619 (40.78)	52 (17.87)
26–35 years old	604 (39.79)	104 (35.74)
Older than 35 years old	295 (19.43)	135 (46.39)
Household registration			<0.01†
Urban	1115 (73.6)	175 (61.19)		Ref
Rural	400 (26.4)	111 (38.81)		1.70 (1.22 to 2.38)	<0.01
Educational level‡			<0.01*
Primary or below	37 (2.44)	19 (6.53)
Junior high	125 (8.25)	50 (17.18)
Senior high	379(25)	93 (31.96)
Junior college	376 (24.8)	59 (20.27)
College or above	599 (39.51)	70 (24.05)
Marital status			<0.01†
Unmarried	1258 (82.87)	86 (29.55)		Ref
Married	132 (8.7)	184 (63.23)		19.93 (14.13 to 28.10)	<0.01
Divorced/widowed	128 (8.43)	21 (7.22)		2.45 (1.42 to 4.23)	<0.01
Monthly income (¥)‡			0.09*
≤1000	264 (17.59)	30 (10.34)
1001–3000	532 (35.44)	114 (39.31)
3001–5000	516 (34.38)	111 (38.28)
≥5001	189 (12.59)	35 (12.07)
HIV knowledge score			<0.01†
<11	1063 (70.03)	236 (81.1)		Ref
≥11	455 (29.97)	55 (18.9)		0.65 (0.44 to 0.96)	0.03
HIV testing‡			<0.01†
No	323 (21.33)	88 (30.34)
Yes	1191 (78.67)	202 (69.66)
HIV counselling‡			0.01†
No	581 (38.38)	135 (46.39)
Yes	933 (61.62)	156 (53.61)
Perceived AIDS severity‡			0.19†
High	939 (61.9)	192 (65.98)
Moderate and low	578 (38.1)	99 (34.02)
Perceived the rate of HIV infection among MSM in the city where they live‡			0.72†
High	325 (21.45)	65 (22.41)
Moderate and low	1190 (78.55)	225 (77.59)
Perceived HIV threat to themselves and their families*			<0.01†
High	808 (53.26)	193 (66.78)		Ref
Moderate and low	709 (46.74)	96 (33.22)		0.68 (0.49 to 0.95)	0.03
Sexual role‡			<0.01†
Only ‘1’	371 (24.49)	103 (35.76)
‘1’ and ‘0’	977 (64.49)	174 (60.42)
Only ‘0’	167 (11.02)	11 (3.82)
Unprotected anal sex with male partners in the past month‡			0.12†
No	1053 (73.48)	216 (77.98)
Yes	380 (26.52)	61 (22.02)
Unprotected oral sex with male partners in the past month‡			<0.01†
No	502 (34.6)	128 (46.55)		Ref
Yes	949 (65.4)	147 (53.45)		0.54 (0.39 to 0.74)	<0.01
Looking for sexual partners through the internet in the past 6 months‡			0.52*
Never	570 (37.6)	99 (34.14)
Occasionally	586 (38.65)	124 (42.76)
Sometimes/always	360 (23.75)	67 (23.1)
Alcohol use in the past month‡			0.01*
Never	474 (31.27)	80 (27.49)
Less than once/week	593 (39.12)	104 (35.74)
At least once/week	253 (16.69)	50 (17.18)
At least three times/week	140 (9.23)	40 (13.75)
Almost everyday	56 (3.69)	17 (5.84)
Illicit drug use in the past 6 months‡			0.62†
No	1454(97)	278 (97.54)
Yes	45(3)	7 (2.46)
Diagnosed with STD by doctors in the past 6 months*			<0.01†
No	1407 (92.93)	257 (88.32)
Yes	107 (7.07)	34 (11.68)
Commercial sexual services in the past 6 months‡			0.37†
No	1430 (94.45)	271 (93.13)
Yes	84 (5.55)	20 (6.87)

*Rank-sum test.

†χ2 test;

‡Indicates loss of data.

MSM, men who have sex with men; MSMO, men who have sex with men only; MSMW, men who have sex with men and women; STD, sexually transmitted disease.

Among MSMO, the median depression score was 12 (IQR: 6–19), the prevalence of depression was 35.18%, the median score was 16 (IQR: 9–23) and the prevalence was 50.86% among MSMW (table 2). Both the rank test and the Wald χ2 test showed statistical significance. The prevalence of anxiety was greater and the anxiety score was higher among MSMW than among MSMO (p<0.01). The prevalence of comorbidity was 18.91% among MSMO compared with 32.65% among MSMW. Among MSMO, the proportion of men without depression and anxiety was 60.21% compared with less than half among MSMW (45.36%). The correlation coefficient of the scores for depression and anxiety was 0.70 for MSMW and 0.72 for MSMO.

Table 2

Depression, anxiety and comorbidity between MSMW and MSMO

Mental health	MSMO		MSMW		Z/χ2	P value
	n	%	n	%
Depression
Mean±SD	13.35±9.65		16.53±9.34		5.72*	<0.01
Median	12		16
Yes	534	35.18	148	50.86	25.57†	<0.01
No	984	64.82	143	49.14
Anxiety
Mean±SD	42.14±10.40		45.89±11.14		5.44*	<0.01
Median	41		45
Yes	357	23.52	106	36.43	21.37†	<0.01
No	1161	76.48	185	63.57
Comorbidity depression and anxiety					31.29†	<0.01
Both	287	18.91	95	32.65
One of them	317	20.88	64	21.99
None	914	60.21	132	45.36

*Rank-sum test.

†χ2 test.

MSMO, men who have sex with men only; MSMW, men who have sex with men and women.

The results of a multivariate logistic regression analysis using depression and anxiety as independent variables are shown in tables 3 and 4. The results showed that after adjusting for potential confounding factors, the prevalence of depression and anxiety was 1.89 (95% CI 1.42 to 2.53) and 1.71 (95% CI 1.25 to 2.33) times higher among MSMW than among MSMO, respectively.

Table 3

Multivariate logistic stepwise regression results with depression as the dependent variable

Variable	b	S	χ2	P value	OR (95% CI)
The no of female sexual partners in the past 6 months
MSMO (0)	Ref
MSMW (>0)	0.64	0.15	18.60	<0.01	1.89 (1.42 to 2.53)
Educational level
Primary or below	Ref
Junior high	−0.46	0.36	1.63	0.20	0.63 (0.31 to 1.28)
Senior high	−0.56	0.34	2.80	0.10	0.57 (0.30 to 1.10)
Junior college	−0.58	0.34	2.89	0.09	0.56 (0.29 to 1.09)
College or above	−0.90	0.34	7.29	<0.01	0.41 (0.21 to 0.78)
Monthly income (¥)
≤1000	Ref
1001–3000	−0.17	0.16	1.15	0.28	0.84 (0.61 to 1.15)
3001–5000	−0.49	0.16	9.09	<0.01	0.61 (0.44 to 0.84)
≥5001	−0.73	0.21	11.86	<0.01	0.48 (0.32 to 0.73)
HIV counselling
No	Ref
Yes	−0.52	0.11	23.02	<0.01	0.59 (0.48 to 0.73)
Perceived the rate of HIV infection among MSM in the city where they live
High	Ref
Moderate and low	−0.36	0.13	7.65	<0.01	0.70 (0.54 to 0.90)
Sexual role
Only ‘1’	Ref
‘1’ and ‘0’	0.27	0.13	4.57	0.03	1.32 (1.02 to 1.69)
Only ‘0’	0.62	0.20	9.51	<0.01	1.86 (1.25 to 2.76)
Looking for sexual partners through the internet in the past 6 months
Never	Ref
Occasionally	0.07	0.13	0.31	0.58	1.07 (0.84 to 1.38)
Sometimes/always	0.47	0.14	11.46	<0.01	1.61 (1.22 to 2.16)
Alcohol use in the past 1 month
Never	Ref
Less than once/week	−0.30	0.13	5.24	0.02	0.74 (0.57 to 0.96)
At least once/week	−0.12	0.16	0.52	0.47	0.89 (0.65 to 1.23)
At least three times/week	0.13	0.19	0.45	0.50	1.14 (0.78 to 1.66)
Almost every day	0.60	0.28	4.53	0.03	1.82 (1.05 to 3.15)

MSM, men who have sex with men; MSMO, men who have sex with men only; MSMW, men who have sex with men and women.

Table 4

Multivariate logistic stepwise regression results with anxiety as the dependent variable

Variable	b	S	χ2	P value	OR (95% CI)
The no of female sexual partners in the past 6 months
MSMO (0)	Ref
MSMW (>0)	0.53	0.16	11.36	<0.01	1.71 (1.25 to 2.33)
Age
18–25 years old	Ref
26–35 years old	−0.32	0.14	5.25	0.02	0.73 (0.56 to 0.96)
Older than 35 years old	−0.43	0.17	6.90	<0.01	0.65 (0.47 to 0.90)
Educational level
Primary or below	Ref
Junior high	−0.43	0.35	1.51	0.22	0.65 (0.33 to 1.29)
Senior high	−0.76	0.33	5.43	0.02	0.47 (0.25 to 0.89)
Junior college	−0.83	0.33	6.32	0.01	0.44 (0.23 to 0.83)
College or above	−1.29	0.33	15.36	<0.01	0.28 (0.15 to 0.53)
HIV knowledge score
<11	Ref
≥11	−0.30	0.14	4.48	0.03	0.74 (0.57 to 0.98)
Perceived the rate of HIV infection among MSM in the city where they live
High	Ref
Moderate and low	−0.40	0.14	8.41	<0.01	0.67 (0.51 to 0.88)
Looking for sexual partners through the internet in the past 6 months
Never	Ref
Occasionally	−0.09	0.14	0.42	0.52	0.91 (0.69 to 1.21)
Sometimes/always	0.36	0.15	5.73	0.02	1.44 (1.07 to 1.94)
Alcohol use in the past month
Never	Ref
Less than once/week	−0.47	0.15	10.21	<0.01	0.63 (0.47 to 0.83)
At least once/week	−0.19	0.18	1.12	0.29	0.83 (0.59 to 1.17)
At least three times/week	0.08	0.20	0.17	0.68	1.09 (0.73 to 1.62)
Almost every day	0.01	0.29	0.01	0.97	1.01 (0.57 to 1.79)
Commercial sexual services in the past 6 months
No	Ref
Yes	0.47	0.23	4.32	0.04	1.60 (1.03 to 2.50)

MSM, men who have sex with men; MSMO, men who have sex with men only; MSMW, men who have sex with men and women.

The prevalence of depression was associated with educational level (college or above vs primary or below: OR 0.41, 95% CI 0.21 to 0.78) and monthly income (3001–5000 vs ≤1000: OR 0.61, 95% CI 0.44 to 0.84); ≥5001 vs ≤1000: OR 0.48, 95% CI 0.32 to 0.73).

The prevalence of depression was higher among those who had never engaged in HIV counselling and those who perceived a high rate of HIV infection among MSM in the city where they lived. Compared with participants who reported only ‘1’ for their sexual role, participants who reported both ‘0’ and ‘1’ for their sexual roles and participants who reported only ‘0’ for their sexual role showed higher rates of depression (OR 1.32, 95% CI 1.02 to 1.70; OR 1.86, 95% CI 1.25 to 2.76). Participants who sometimes/always looked for sexual partners through the internet had a higher prevalence of depression than those who never searched for partners using these methods (OR 1.61, 95% CI 1.22 to 2.16). The prevalence of depression was lower for those who drank less than once a week than for those who never drank, while the prevalence of depression was higher for those who almost drank every day than for those who never drank (table 3).

A high prevalence of anxiety was associated with young age (16–25 years vs 18–25 years: OR 0.73, 95% CI 0.56 to 0.96; ≥35 years vs 18–25 years: OR 0.65, 95% CI 0.47 to 0.90), lower education level and lower HIV score. The prevalence of anxiety was higher for those who perceived a high rate of HIV infection among MSM in the city where they lived. Participants who sometimes/always looked for sexual partners through the internet had a higher prevalence of anxiety than those who had never looked for partners using these methods (OR 1.44, 95% CI 1.07 to 1.94) and those who had obtained commercial sexual services in the past 6 months. Anxiety was lower among those who drank less than once a week than among those who never drank (OR 0.63, 95% CI 0.47 to 0.83). There was no significant difference between drug use and the prevalence of anxiety and depression (table 4).

Discussion

This cross-sectional study found that the prevalence of depression, anxiety and comorbidity was higher among HN MSMW than among MSMO. When compared with the Chinese general population, MSMW had a higher score for depression (13.24±10.33).36 However, there were no significant differences in depression scores between MSMO and the general population.

Although numerous studies have demonstrated that the prevalence of depression and anxiety among MSM is higher than that of the general population,37–41 few studies have compared the differences between MSMW and MSMO. Our study indicates that MSMW show a higher prevalence of depression and anxiety than MSMO after adjusting for potential confounding factors, which is consistent with another study conducted in the USA.26 One possible explanation for why MSMW report more mental health problems is their high gender role conflict, which Bingham et al described as ‘internal conflict with traditional gender role stereotypes and an individual’s perceived need to comply with these roles’.42 In addition, 16.1% (291/1518) of MSM were classified as MSMW in this study, which is higher than the rates observed in 13 European cities (12.64%, 589/4658),22 and nearly 70% of MSMW were married or divorced, in accordance with the results from Zhang et al.43 The Chinese traditional value of ‘having a son to carry on the family name’ may create more stress for MSMW because those who are married may be struggling and caught in a dilemma of whether they should disclose their sexual orientation to their family members. Mirandola et al 22 found that MSMW were less likely than MSMO to be open with their family and friends about their sexual attraction. As a result, MSMW may lack social support, making them vulnerable to mental health problems.44

In line with other studies,25 45 this study revealed that MSM with higher education levels and higher income were less likely to suffer from anxiety and depression. Low socioeconomic status was associated with depression, which was also reported in the general population.46 Younger MSM had a higher prevalence of anxiety than older MSM, indicating that older people have greater resilience, which is consistent with the results of McGowan et al.47 Additionally, MSM who perceived higher rates of HIV infection among MSM in their cities were more likely to report depression and anxiety, and those who lacked HIV knowledge were more likely to experience anxiety, suggesting that their own incorrect understanding of HIV and high threat perception contributed to certain psychological burdens, rendering them more likely to experience mental health problems.

In the present study, we found that the prevalence of depression and anxiety was related to some risky sexual behaviour. Among MSM, there was a high frequency of looking for partners through the internet, never having HIV counselling, receiving commercial sexual services in the past 6 months and mainly playing a ‘0’ role in their sexual behaviour, which is consistent with the results of studies conducted in other countries.48–50 A relationship between mental health and risky sexual behaviour has been reported,51 52 although the mechanism is relatively limited. One study conducted in metro Vancouver offered the interpretation that polydrug use partially mediated the relationship between depression and risky sexual behaviour.53

When we examined the relationship between substance use and depression and anxiety, no associations were found between the illicit use of any drug and mental health. However, this finding should be interpreted with caution given that the number of drug users in this study was low (3%, 52/1784), and previous studies have shown relationships between illicit drug use and depression and anxiety in MSM, women and other groups.53–57 Co-occurrence of illicit drug use and depression contributing to an increased risk for high-risk sex was also reported.53 58 Thus, more studies should be conducted in China in the future to verify the relationship between drug use and depression among MSM. The prevalence of anxiety and depression was lower among MSM who reported moderate drinking (once a week) than among those who never drank, while the prevalence was higher among MSM who drank almost every day than among those who never drank. Drinking (once a week) may occur as part of interpersonal communications, and moderate social interaction contributes to alleviating stress, while excessive drinking (almost every day) is harmful to physical and mental health.

This study highlights the need to address mental health among MSMW rather than merely focusing on comparisons between MSM and the general population. Although this study focused only on HN MSMW, it is possible that HP MSMW have more severe mental health problems; thus, future studies should be conducted. HN MSMW reported high rates of depression, anxiety and comorbidity, which could be attributed to the potential existence of internal status (gender role conflict42) and external environment. MSMW may identify themselves as neither gay nor heterosexual, leading to internal gender role conflict. Furthermore, stigma, prejudice and discrimination59 are possible in the external environment. Based on the findings of this and other studies,60 61 it is essential for MSMW to establish a sound social support system consisting of the combined efforts of family, friends, female partners and society. Providing MSMW with adequate support is beneficial in helping them to overcome difficult situations. Furthermore, as the relationship between mental health and risky sexual behaviour has been documented, future health interventions could integrate mental health services and HIV prevention programmes and should consider the differences between MSMW and MSMO.

This study has some shortcomings. First, we recruited the participants by non-probability sampling, which may lead to some bias and limit the generalisability of this study. Second, in this paper, MSMW were identified based on whether they had female sexual partners in the past 6 months. Ramakrishnan et al 21 classified MSMW in the past month as the standard, and Davis et al,62 Phillips et al 63 and Tao et al 20 defined MSMW based on a longer time (a year or ever). A reasonable unified standard to identify the MSMW group is expected in future studies. In addition to the serological status of HIV, other information was self-reported. The results for some sensitive issues may therefore be biased. Furthermore, this study involved only a cross-sectional survey. Cohort studies could be conducted to confirm these findings in subsequent studies.

Conclusion

In summary, this study found a higher prevalence of depression, anxiety and comorbidity and associated factors for depression and anxiety among HN MSMW than among MSMO. Our findings suggest the need to address mental health among MSMW. Future health intervention strategies should integrate mental health services and traditional HIV prevention programmes and should consider the differences between MSMW and MSMO.