| Literature DB >> 30574337 |
Joseph E Mroz1, Carol H Pullen1, Patricia A Hageman1.
Abstract
This study investigated whether women's initial reasons (health, appearance to others, or appearance to self) for wanting to lose weight influenced their weight change over a 30-month web-based intervention. Multilevel modeling with 1416 observations revealed that only appearance in relation to one's self was a significant (negative) predictor. Women highly motivated to lose weight to improve their appearance in relation to themselves gained weight at 30 months, whereas those not motivated for this reason achieved clinically significant weight loss. Results suggest examining participants' initial reasons for weight loss as an important component of intervention failure or success.Entities:
Keywords: appearance; body image; females; health behavior; weight loss; women’s health
Year: 2018 PMID: 30574337 PMCID: PMC6299317 DOI: 10.1177/2055102918816606
Source DB: PubMed Journal: Health Psychol Open ISSN: 2055-1029
Descriptive statistics and correlations of between-participant variables.
| Variable |
| SD | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|---|---|
| 1. Age | 53.94 | 6.88 | – | |||||
| 2. BMI | 34.84 | 4.21 | –0.06 | – | ||||
| 3. Group | – | – | –0.07 | 0.03 | – | |||
| 4. Health reason | 3.69 | 0.34 | 0.20 | 0.02 | –0.02 | 0.70 | ||
| 5. Appearance to others | 2.94 | 0.64 | –0.11 | –0.11 | 0.06 | 0.26 | 0.86 | |
| 6. Appearance to self | 1.68 | 0.63 | –0.10 | 0.11 | –0.03 | 0.23 | 0.66 | 0.90 |
SD: standard deviation; BMI: body mass index.
N = 236. Estimates of internal consistency displayed on diagonal where appropriate. For group, 1 = web only, 2 = discussion, 3 = email.
p < 0.001; *p < 0.01.
Multilevel model estimates.
| Predictors | Model 2 (effects of time) | Model 3 (covariates) | Model 4 (final) | |||
|---|---|---|---|---|---|---|
| Intercept | 0.05 (0.01) | 15.27 (224)* | 0.05 (0.01) | 15.01 (220)* | 0.05 (0.01) | 15.33 (217)* |
| Internet versus email group | <0.01 (0.01) | 0.75 (220) | <0.01 (0.01) | 0.63 (217) | ||
| Internet versus discussion group | <–0.01 (0.01) | –0.66 (220) | <–0.01 (0.01) | –0.47 (217) | ||
| BMI | –0.01 (0.01) | –1.56 (220) | <–0.01 (0.01) | –1.37 (217) | ||
| Age | <0.01 (0.01) | 1.02 (220) | <0.01 (0.01) | 1.00 (217) | ||
| Health reason | <0.01 (0.01) | 0.53 (217) | ||||
| Appearance to others | <–0.01 (0.01) | –0.06 (217) | ||||
| Appearance to self | –0.01 (0.01) | –1.48 (217) | ||||
|
| 67.94% | 567.02 (5) | 0.45% | 14.29 (4)* | 0.46% | 33.75 (3)* |
| Change over time (linear) | –0.03 (0.01) | –2.31 (224)* | –0.03 (0.01) | –2.60 (220)* | –0.03 (0.01) | –2.91 (217)* |
| Internet versus email group | 0.04 (0.02) | 2.13 (220)* | 0.03 (0.02) | 1.90 (217) | ||
| Internet versus discussion group | –0.03 (0.02) | –1.83 (220) | –0.03 (0.02) | –1.57 (217) | ||
| BMI | <0.01 (0.01) | 0.06 (220) | 0.01 (0.01) | 0.67 (217) | ||
| Age | –0.03 (0.01) | 2.29 (220)* | 0.04 (0.01) | 3.00 (217)* | ||
| Health reason | –0.02 (0.01) | –1.60 (217) | ||||
| Appearance to others | 0.02 (0.02) | 1.07 (217) | ||||
| Appearance to self | –0.04 (0.02) | –2.31 (217)* | ||||
|
| 3.20% | 17.55 (4)* | 3.49% | 18.63 (3)* | ||
| Change over time (curvilinear) | <0.01 (0.01) | 0.20 (224) | <0.01 (0.01) | 0.48 (220) | 0.01 (0.01) | 0.66 (217) |
| Internet versus email group | –0.03 (0.02) | –1.84 (220) | –0.03 (0.01) | –1.67 (217) | ||
| Internet versus discussion group | 0.03 (0.02) | –1.84 (220) | 0.02 (0.01) | 1.60 (217) | ||
| BMI | <0.01 (0.01) | 0.48 (220) | <–0.01 (0.01) | –0.06 (217) | ||
| Age | –0.02 (0.01) | –2.22 (220)* | –0.03 (0.01) | –2.80 (217) | ||
| Health reason | 0.03 (0.01) | 1.29 (217) | ||||
| Appearance to others | –0.01 (0.01) | –0.83 (217) | ||||
| Appearance to self | 0.04 (0.01) | 2.04 (217)* | ||||
|
| 2.94% | 9.89 (4) | 3.02% | 13.28 (3)* | ||
SE: standard error; BMI: body mass index; PRPE: proportional reduction in preduction error.
Model 2 is compared to the unconditional model that included no predictors of the dependent variable.
Figure 1.The effect of baseline motivation to lose weight for self-appearance reasons on weight loss at 3 months through 30 months. Women who were highly motivated on this factor at baseline gained weight, on average, 30 months later, whereas women minimally motivated by this factor lost 6 percent of their baseline weight. Effects are controlling for baseline BMI, age, other reasons for wanting to lose weight, and intervention group. Negative weight loss indicates weight gain relative to baseline weight.