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28 We examined covariate balance between workers in the intervention and comparison factories to determine how well matched the workers were on sociodemographic variables that could affect depressive symptoms.
Another important limitation to the interpretation and generalisability of our findings is the non-randomised assignment of workers to intervention and comparison factories, due to ethical and logistical constraints.
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Intervention factory workers had fewer depressive symptoms than comparison factory workers (unadjusted mean CES-D scores: 10.6±9.3 vs 14.7±11.6, p=0.007).
At the comparison factory, 132 of 180 total workers were eligible to complete surveys based on the same eligibility criteria.
Workers at the intervention factory were not statistically different from workers at the comparison factory for age, childhood health and total years of work experience (table 1).
Workers at the intervention factory had significantly lower levels of depression symptoms than workers at the comparison factory in both unadjusted and adjusted analyses.
The final sample consisted of 204 workers, 99 workers from the initial batch of hires at the intervention factory and 105 workers from the comparison factory.
Workers at the intervention factory also had a 47% reduced risk of clinically significant levels of depressive symptoms as compared with workers at the comparison factory.
Workers at the intervention factory had lower mean depressive symptom scores than workers at the comparison factory (10.6±9.3 vs 14.7±11.6, p=0.007) (table 2); depressive symptom scores had a much wider distribution among workers at the comparison factory when compared with the intervention factory (figure 1).
The comparison factory was also in a free trade zone, which implies a similar economic climate in terms of taxes, duties and import/export regulations.
The comparison factory was selected because it was an apparel factory of similar size to the intervention factory and was located less than 50 miles from the intervention factory.
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