Table 3.
The per cent increases in daily IS counts and deaths with each IQR increment in air pollutant levels in two-pollutant models in Changzhou, 2015–2016
| Variables | PM2.5 | PM10 | NO2 | SO2 | CO |
| Daily IS counts* | |||||
| PM2.5 | −0.063 (−0.215 to 0.088) |
0.25 (−0.314 to 0.817) |
0.497 (0.259 to 0.735)† |
0.305 (0.083 to 0.527) † |
−0.059 (−0.274 to 0.157) |
| PM10 | −0.423 (−0.881 to 0.038) |
−0.053 (−0.22 to 0.114) |
0.539 (0.29 to 0.788)† |
0.262 (0.034 to 0.491) † |
−0.065 (−0.293 to 0.163) |
| NO2 | −0.346 (−0.558 to 0.134) |
−0.438 (−0.691 to 0.185) |
0.208 (0.036 to 0.381)† |
−0.007 (−0.267 to 0.253) |
−0.341 (−0.556 to 0.124) |
| SO2 | −0.24 (−0.46 to 0.019) |
−0.244 (−0.49 to 0.003) |
0.22 (−0.067 to 0.507) |
0.125 (−0.034 to 0.284) |
−0.166 (−0.356 to 0.023) |
| CO | −0.089 (−0.314 to 0.137) |
0.029 (−0.223 to 0.281) |
0.45 (0.215 to 0.685)† |
0.172 (−0.016 to 0.361) |
−0.078 (−0.22 to 0.064) |
| Daily IS deaths‡ | |||||
| PM2.5 | 0.228 (−0.005 to 0.462) |
0.436 (−0.36 to 1.238) |
0.22 (−0.127 to 0.567) |
0.28 (−0.071 to 0.632) |
0.065 (−0.314 to 0.446) |
| PM10 | 0.211 (−0.463 to 0.89) |
0.268 (0.007 to 0.528)† |
0.218 (−0.135 to 0.573) |
0.295 (−0.055 to 0.646) |
0.137 (−0.23 to 0.504) |
| NO2 | 0.106 (−0.201 to 0.414) |
0.149 (−0.21 to 0.509) |
0.263 (0.004 to 0.522)† |
0.351 (−0.096 to 0.8) |
0.057 (−0.269 to 0.384) |
| SO2 | 0.066 (−0.25 to 0.383) |
0.126 (−0.242 to 0.496) |
0.066 (−0.387 to 0.521) |
0.34 (0.088 to 0.592)† |
0.035 (−0.281 to 0.351) |
| CO | 0.186 (−0.199 to 0.571) |
0.233 (−0.187 to 0.656) |
0.23 (−0.14 to 0.601) |
0.346 (0.002 to 0.691)† |
0.175 (−0.042 to 0.392) |
The data are expressed as the mean with 95% CI.
*The multivariable regression model fits the pollutants for daily IS counts data at lag 0-5 and adjusts for the other pollutants, calendar time (df=7), DOW (df=5), daily average humidity (df=5) and average temperature (df=5).
†Statistically positive association between air pollutants and daily IS counts or deaths.
‡The multivariable regression model fits the pollutants for daily IS deaths data at lag 5 and adjusts for the other pollutants, calendar time (df=7), DOW (df=5), daily average humidity (df=5) and average temperature (df=5).
CO, carbon monoxide; DOW, day of week; IS, ischaemic stroke; NO2, nitrogen dioxide; PM2.5, particulate matter <2.5 µm in diameter; PM10, particulate matter <10 µm in diameter; SO2, sulfur dioxide.