| Literature DB >> 24009770 |
Ruth Magnolia Martínez-Peña1, Almira L Hoogesteijn, Stephen J Rothenberg, María Dolores Cervera-Montejano, Julia G Pacheco-Ávila.
Abstract
Cleaning products are associated with many health and environmental problems. Contamination of water resources by cleaning products is more likely to occur with septic tanks as sewage treatment systems especially in karstic terrains. We explored women's ideas about water sources and the risk cleaning products pose to health and sewage in Mérida, a city in the Yucatán peninsula of Mexico. Women were unaware of the city's water management system. We found a positive and statistically significant association between risk perception and environmental awareness, education level and employment status. We suggest developing education and risk communication strategies to inform residents about the hydro-geological features in the Yucatán, the vulnerability of its karstic aquifer and the health and environmental risks associated with cleaning agents.Entities:
Mesh:
Year: 2013 PMID: 24009770 PMCID: PMC3751835 DOI: 10.1371/journal.pone.0074352
Source DB: PubMed Journal: PLoS One ISSN: 1932-6203 Impact factor: 3.240
Sociodemographic characteristics (control variables) of the study group.
| Data included in OLS | Data excluded from OLS | ||||
|---|---|---|---|---|---|
| Variable | N | % | N | % |
|
| Age | 0.920 | ||||
| ≤ 29 | 133 | 19.6 | 6 | 16.2 | |
| 30–44 | 491 | 72.4 | 28 | 75.7 | |
| ≥ 45 | 54 | 8.0 | 3 | 8.1 | |
| Education level** | 0.604 | ||||
| Low | 263 | 38.8 | 11 | 47.8 | |
| Middle | 142 | 20.9 | 5 | 21.7 | |
| High | 273 | 40.3 | 7 | 30.4 | |
| Income*** | 0.965 | ||||
| ≤ 4 | 221 | 39.6 | 10 | 43.5 | |
| >4 − 10 | 111 | 19.9 | 5 | 21.7 | |
| >10 − 25 | 177 | 31.7 | 7 | 30.4 | |
| >25 | 49 | 8.8 | 1 | 4.4 | |
| Occupation | 0.629 | ||||
| Housewife | 382 | 56.3 | 20 | 60.6 | |
| Outside employee | 296 | 43.7 | 13 | 39.4 | |
* p-values were calculated from Fisher exact and chi-squared tests, depending on the observed value in the cells.
** Low: no educated-secondary school; middle: incomplete high school-incomplete college; and high: complete college-postgraduate.
*** Income is expressed as multiples of the minimum monthly wage in 2007 (MXN $ 1,428 or USD$116.4). Income data were reported only by 581 participants.
Rasch Model Fitness diagnoses for the Environmental Awareness Scale (EAS).
| Outfit | Answers (%) | |||||
|---|---|---|---|---|---|---|
| ITEM* | Difficulty (logits) | Standard error | MNSQ | Z | Right | Wrong |
| A septic tank is a container that transforms gray water into clean | -1.84 | 0.12 | 0.82 | -1.2 | 86 | 2 |
| water. | ||||||
| The sludge from septic tanks is obtained and transformed into | 0.88 | 0.09 | 0.83 | -2.9 | 42 | 10 |
| fertilizer. | ||||||
| The ocean is the source of tap water. | -0.57 | 0.09 | 0.87 | -1.9 | 68 | 7 |
| The water extracted from wells comes from underground water | -0.56 | 0.09 | 0.95 | -0.7 | 69 | 9 |
| sources. | ||||||
| Almost the 100% of gray water in the city leaks into the ground | -0.94 | 0.1 | 0.97 | -0.3 | 74 | 6 |
| and can contaminate the underground sources of water. | ||||||
| The gray water from households is transformed into drinking | 0.78 | 0.09 | 1.01 | 0.2 | 43 | 18 |
| water in treatment plants. | ||||||
| Rain is the source of tap water. | -0.67 | 0.09 | 1.04 | 0.5 | 70 | 5 |
| The gray water from septic tanks goes into the ground. | -0.01 | 0.09 | 1.13 | 2.1 | 59 | 13 |
| Tap water comes from underground water sources. | 0.45 | 0.09 | 1.08 | 1.4 | 51 | 17 |
| Sludge and gray water from septic tanks go to a hole on the | 2.48 | 0.11 | 1.33 | 2.1 | 17 | 30 |
| ground. | ||||||
* Items are listed in order of MNSQ.
Figure 1Mean of Environmental Awareness (EA) in logits, according to the sociodemographic variables.
A. Age; B. Education level (low: no educated−secondary school; middle: incomplete high school−incomplete college; and high: complete college−postgraduate); C. Income (expressed as multiples of Minimum Monthly Wage, MMW. One MMW = USD $110); and D. Occupation.
Rasch Model Fitness diagnoses for the Risk Perception Scale (RPS).
| ITEM* | Difficulty (logits) | Standard error | Outfit | |
|---|---|---|---|---|
| MNSQ | Z | |||
| Waste of cleaning products helps marine fauna. | -0.29 | 0.12 | 0.74 | -2.2 |
| Waste of cleaning products can contaminate groundwater. | -0.11 | 0.12 | 0.80 | -1.8 |
| Cleaning products are harmless. | 0.11 | 0.11 | 0.88 | -1.2 |
| Waste of detergents helps to clean groundwater. | 0.84 | 0.10 | 0.90 | -1.6 |
| It is possible to get clean surfaces using less detergent. | 0.47 | 0.10 | 0.95 | -0.6 |
| It is necessary to use more detergent to get cleaner surfaces. | 1.33 | 0.09 | 0.96 | -0.8 |
| It is important to read the cleaning products’ labels. | -3.22 | 0.39 | 0.99 | 0.1 |
| Mixing different cleaning products is good to clean better. | 1.35 | 0.09 | 1.01 | 0.2 |
| Cleaning products can affect people’s health. | -0.07 | 0.12 | 1.07 | 0.7 |
| Mixing cleaning products can be dangerous. | 0.13 | 0.11 | 1.08 | 0.9 |
| It is useless to read the cleaning product directions for use. | 0.9 | 0.10 | 1.10 | 1.6 |
| Waste of cleaning products reaches the ocean and affects marine fauna. | 0.93 | 0.10 | 1.14 | 2.2 |
| Cleaning products must be kept out of the reach of children. | -1.69 | 0.20 | 1.23 | 0.9 |
| Children can ingest cleaning products by accident and get poisoned. | -0.66 | 0.14 | 1.39 | 2.3 |
| Antibacterial detergents are better because they prevent diseases. | REMOVED | |||
| Antibacterial detergents help some bacteria to get stronger. | REMOVED | |||
* Items are listed in order of MNSQ. Last two items were removed due to their MNSQ values were higher than 1.5.
Figure 2Mean of Risk Perception (RP) in logits, according to the sociodemographic variables.
A. Age; B. Education level (low: no educated−secondary school; middle: incomplete high school−incomplete college; and high: complete college−postgraduate); C. Income (expressed as multiples of Minimum Monthly Wage, MMW. One MMW = USD $116); and D. Occupation.
Results of OLS regression analysis for Environmental Awareness (EA) Scores as dependent variable (n = 678; R2 = 0.0849).
| Environmental Awareness* | Coefficient** | t |
| Confidence interval (95%)*** |
|---|---|---|---|---|
| Age (30–44)a | 1.54 | 3.54 | < 0.001 | 1.21–1.95 |
| Age (≥45)a | 1.93 | 3.33 | 0.001 | 1.31–2.86 |
| Middle Educationb | 1.21 | 1.36 | 0.173 | 0.91–1.61 |
| High Educationb | 1.66 | 3.74 | < 0.001 | 1.27–2.16 |
| Outside employeec | 1.12 | 0.99 | 0.321 | 0.89–1.40 |
| Constant | -0.79 | -2.31 | 0.021 | 0.64–0.96 |
* Environmental Awareness was measured in logits or the log-odds transformation of the probability of a response.
** Regression coefficients are presented as exp(logits).
*** Confidence intervals were calculated using heteroscedasticity–correct standard errors.
a Comparison group: < 29 years.
b Comparison group: Low Education
c Comparison group: Housewife.
Results of OLS regression analysis for Risk Perception (RP) Scores as dependent variable (n = 678; R2 = 0.2125).
| Risk Perception* | Coefficient** | z |
| Confidence interval (95%)*** |
|---|---|---|---|---|
| Environmental Awareness Score | 1.24 | 4.40 | 0.000 | 1.13–1.36 |
| Age (30–44)a | 1.23 | 1.68 | 0.092 | 0.97–1.57 |
| Age (≥45)a | 1.35 | 0.15 | 0.881 | 0.69–1.53 |
| Middle Educationb | 2.00 | 5.48 | 0.000 | 1.56–2.58 |
| High Educationb | 2.59 | 7.46 | 0.000 | 2.02–3.33 |
| Employee | 1.24 | 2.07 | 0.038 | 1.01–1.53 |
| Constant | 3.63 | 12.33 | 0.000 | 2.96–4.46 |
* Risk Perception was measured in logits or the log-odds transformation of the probability of a response.
** Regression coefficients are presented as exp(logits).
*** Confidence intervals were calculated using heteroscedasticity–correct standard errors.
a Comparison group: < 29 years.
b Comparison group: Low Education.
c Comparison group: Housewife.