Adjusted OR for stroke unit admissions for acute ischaemic stroke according to an increase in IQR of each air pollutant by age and season, in Tianjin, from 1 April 2018 to 31 March 2019
| Pollutants | IQR | <70 years old (n=269) | ≥70 years old (n=251) | <70 years old (April–September) (n=150) | <70 years old (October–March) (n=119) |
| OR (95% CI) | OR (95% CI) | OR (95% CI) | OR (95% CI) | ||
| PM2.5 | |||||
| Same-day | 37.0 | 1.00 (0.99 to 1.00) | 0.99 (0.99 to 1.00) | 1.30 (0.94 to 1.79) | 1.00 (0.99 to 1.01) |
| 1-day lag | 1.00 (0.99 to 1.01) | 0.99 (0.98 to 1.00) | 1.38 (0.99 to 1.98) | 1.00 (0.99 to 1.00) | |
| 3-day | 1.00 (0.99 to 1.01) | 1.00 (0.99 to 1.00) | 1.00 (0.95 to 1.05) | 1.00 (0.99 to 1.0) | |
| PM10 | |||||
| Same-day | 55.5 | 0.96 (0.80 to 1.15) | 0.85 (0.71 to 1.02) | 1.25 (0.92 to 1.70) | 0.88 (0.66 to 1.19) |
| 1-day lag | 1.00 (0.99 to 1.01) | 0.99 (0.98 to 1.00) | 1.49 (1.09 to 2.02)* | 1.00 (0.99 to 1.00) | |
| 3-day | 0.98 (0.80 to 1.20) | 0.85 (0.70 to 1.03) | 1.58 (1.09 to 2.29)* | 0.88 (0.65 to 1.20) | |
| SO2 | |||||
| Same-day | 9.0 | 0.99 (0.96 to 1.03) | 0.97 (0.93 to 1.01) | 1.13 (0.82 to 1.56) | 0.99 (0.96 to 1.04) |
| 1-day lag | 0.99 (0.96 to 1.03) | 0.98 (0.95 to 1.01) | 1.07 (0.78 to 1.47) | 1.00 (0.95 to 1.05) | |
| 3-day | 1.00 (0.95 to 1.04) | 0.96 (0.92 to 1.00) | 1.15 (0.77 to 1.71) | 1.01 (0.95 to 1.07) | |
| CO | |||||
| Same-day | 0.4 | 1.10 (0.70 to 1.73) | 0.94 (0.60 to 1.48) | 1.10 (0.82 to 1.48) | 1.02 (0.64 to 1.63) |
| 1-day lag | 1.01 (0.62 to 1.64) | 0.95 (0.59 to 1.53) | 1.07 (0.79 to 1.44) | 1.36 (0.80 to 2.31) | |
| 3-day | 1.03 (0.56 to 1.88) | 0.86 (0.53 to 1.39) | 1.14 (0.83 to 1.57) | 1.24 (0.61 to 2.50) | |
| NO2 | |||||
| Same-day | 29.0 | 1.00 (0.99 to 1.01) | 0.99 (0.97 to 1.01) | 1.17 (0.79 to 1.75) | 1.00 (0.99 to 1.02) |
| 1-day lag | 0.99 (0.98 to 1.01) | 0.99 (0.98 to 1.00) | 1.02 (0.72 to 1.44) | 0.99 (0.98 to 1.01) | |
| 3-day | 1.00 (0.99 to 1.02) | 0.99 (0.97 to 1.00) | 1.10 (0.70 to 1.72) | 1.00 (0.98 to 1.02) | |
| O3 | |||||
| Same-day | 99.5 | 0.83 (0.61 to 1.11) | 0.87 (0.64 to 1.18) | 1.15 (0.78 to 1.71) | 0.75 (0.47 to 1.19) |
| 1-day lag | 0.97 (0.74 to 1.27) | 0.92 (0.66 to 1.27) | 1.49 (0.98 to 1.90) | 0.72 (0.45 to 1.16) | |
| 3-day | 1.04 (0.69 to 1.55) | 0.84 (0.57 to 1.24) | 1.11 (0.72 to 1.72) | 0.88 (0.45 to 1.74) |
All ORs were adjusted for same-day, 1-day lag and 3-day temperature and relative humidity, respectively.
*P＜0.05.
†
CO, carbon monoxide; NO2, nitrogen dioxide; O3, ozone; PM, particulate matter; SO2, sulfur dioxide.