Table 3.
Hazard ratiosa of major depressive disorder for an increase of 10 μg/m3 in the annual PM2.5 concentration in 2007, stratified by underlying chronic diseases.
| Disease | No.b | HR (95% CI) | p for interaction |
|---|---|---|---|
| DM | |||
| (+) | 350/5,252 | 1.83 (1.26, 2.64) | 0.12 |
| (–) | 623/22,018 | 1.27 (0.98, 1.64) | |
| CVD | |||
| (+) | 506/8,564 | 1.58 (1.19, 2.12) | 0.64 |
| (–) | 467/18,706 | 1.31 (0.96, 1.77) | |
| COPD | |||
| (+) | 389/7,530 | 1.64 (1.17, 2.30) | 0.44 |
| (–) | 583/19,740 | 1.35 (1.03, 1.77) | |
| Abbreviations: +, individuals with the underlying disease; –, individuals without the underlying disease. CI, confidence interval; COPD, chronic obstructive pulmonary disease; CVD, cardiovascular disease; DM, diabetes mellitus; HR, hazard ratio; PM2.5, particulate matter with an aerodynamic diameter ≤ 2.5 μm. aThe models were stratified by sex and age, and adjusted for household income, smoking status, alcohol consumption, regular exercise, size of the population, proportion of married persons among the population ≥ 15 years of age, economic and social environment satisfaction, number of clients of the social welfare facilities per capita, and deprivation index in the district in which each participant resided. bNumber of events during the follow-up period/total number analyzed, stratified by underlying chronic diseases. | |||