Table 3.
Estimated high blood pressure burden attributable to ambient PM2.5 exposure.
| Variable | No. of Observations with HBP, N (%) | Population Attributable Risk % and 95% CI | |
|---|---|---|---|
| Annual Mean Pollution Level a | Ratio of Polluted Days b | ||
| Overall | 5222 (9.8) | 1.16 (0.80, 1.52) | 2.85 (2.42, 3.29) |
| Sex | |||
| Boys | 2913 (10.6) | 1.17 (0.81, 1.53) | 2.85 (2.41, 3.29) |
| Girls | 2309 (9.0) | 1.15 (0.79, 1.51) | 2.85 (2.43, 3.28) |
| Age group | |||
| ≤9 years old | 2065 (11.5) | 1.16 (0.78, 1.54) | 2.68 (2.24, 3.12) |
| 10–12 years old | 1796 (15.5) | 1.20 (0.83, 1.57) | 2.75 (2.30, 3.20) |
| 13–15 years old | 944 (8.0) | 1.12 (0.80, 1.45) | 2.93 (2.48, 3.37) |
| 16–18 years old | 417 (3.5) | 1.16 (0.80, 1.52) | 3.14 (2.73, 3.55) |
PM2.5, particulate matter with aerodynamic diameter ≤2.5 μm; HBP: high blood pressure; OR: odds ratio; CI: confidential interval; PAR: population attributable risk. Groups with the lowest high blood pressure prevalence were set as reference group in calculating population attributable risk (%), that was a the lowest quartile and b the third quartile, separately.