Stata version 10

A descriptive analysis was carried out of all sociodemographic and occupational factors by worker origin (immigrants born in Colombia or Ecuador and those born in Spain). Prevalence of self-perceived eye health was calculated, as well as access to eye care specialists and use of lenses, using the worker’s origin as the explanatory variable, and sociodemographic and occupational variables. Statistically significant differences in the obtained prevalences were examined using Fisher’s exact test. Finally, for each health result (poor self-perceived eye health, limited access to a specialist >3 years or never, and the unmet need for corrective lenses), by worker’s country of origin, logistic regression models were carried out with family-specific random effects. The association measure obtained was odds ratios (OR) with confidence intervals of 95%. Both crude OR (ORc) and adjusted OR (ORa) by all of the explanatory variables and the study city, were calculated. The programs SPSS version 15 (IBM, Armonk, NY, USA) and Stata version 10 (College Station, TX, USA) were used.

Quantitative variables were summarized as medians with interquartile ranges (IQRs), and categorical data were expressed as percentages. In bivariate analyses, the χ² test (or Fisher’s exact test when appropriate) was used to compare categorical variables. A logistic regression model was used to identify factors associated with the presence of ESBL-E in cats and dogs and to calculate crude and adjusted odds ratios and their 95% confidence intervals (95% CI). Multivariate analyses were not performed due to the low number of cases of ESBL-E in cats (6 cases) and in dogs (8 cases). We considered P < 0.05 to be significant. Microsoft Access 2003 was used for data entry. Statistical analyses were performed with Stata Version 10 and SPSS (V21, IBM SPSS Statistics, Chicago, IL, United States).

We restricted our sample to participants who were employed at the baseline (2015; n = 324 (111 Spanish and 213 immigrant)) and reported good mental health (n = 130). After comparing results between immigrant participants and those born in Spain, we evaluated the relationship between length of residence in Spain and incidence of common mental disorders. Odds ratios were crude and adjusted by the city of study, sex, age, educational attainment, occupational class, working hours per week, informal employment, standard hours, physical demands, and income level. Logistic regression models were carried out with family-specific random effects. Data were managed and analysed using the statistical software programs SPSS version 15 (IBM, Armonk, NY, USA) and Stata version 10 (College Station, TX, USA).