Table 3

Adjusted OR for stroke unit admissions for acute ischaemic stroke according to an increase in IQR of each air pollutant by hyperlipidaemia and season, in Tianjin from 1 April 2018 to 31 March 2019

PollutantsIQRHyperlipidaemia (n=289)No hyperlipidaemia (n=231)Hyperlipidaemia (April–September) (n=157)Hyperlipidaemia (October–March) (n=132)
OR (95% CI)OR (95% CI)OR (95% CI)OR (95% CI)
PM2.5
 Same-day37.01.00 (0.99 to 1.00)1.00 (0.99 to 1.00)1.04 (0.77 to 1.39)0.99 (0.99 to 1.00)
 1-day lag1.00 (0.99 to 1.00)0.99 (0.98 to 1.00)1.18 (0.85 to 1.65)1.00 (0.99 to 1.00)
 3-day1.00 (0.99 to 1.00)0.99 (0.98 to 1.00)1.02 (0.95 to 1.08)1.00 (0.99 to 1.00)
PM10
 Same-day55.50.85 (0.71 to 1.00)0.98 (0.81 to 1.19)1.04 (0.79 to 1.36)0.84 (0.65 to 1.10)
 1-day lag1.00 (0.99 to 1.00)0.99 (0.99 to 1.00)1.51 (1.10 to 2.07)*0.99 (0.99 to 1.00)
 3-day0.91 (0.76 to 1.08)0.86 (0.70 to 1.06)1.57 (1.08 to 2.29)*0.82 (0.63 to 1.06)
SO2
 Same-day9.00.99 (0.96 to 1.02)0.99 (0.95 to 1.03)1.21 (0.88 to 1.68)0.99 (0.95 to 1.03)
 1-day lag0.98 (0.95 to 1.01)0.98 (0.95 to 1.03)1.20 (0.87 to 1.65)0.98 (0.95 to 1.02)
 3-day0.99 (0.94 to 1.03)0.97 (0.92 to 1.02)1.31 (0.89 to 1.94)0.98 (0.93 to 1.04)
CO
 Same-day0.41.13 (0.75 to 1.71)0.88 (0.51 to 1.53)1.09 (0.83 to 1.43)0.89 (0.50 to 1.61)
 1-day lag1.00 (0.64 to 1.56)0.78 (0.45 to 1.37)1.12 (0.85 to 1.48)0.79 (0.45 to 1.40)
 3-day0.95 (0.59 to 1.54)0.84 (0.59 to 1.54)1.13 (0.81 to 1.58)0.91 (0.55 to 1.48)
NO2
 Same-day29.00.99 (0.98 to 1.01)0.99 (0.98 to 1.01)1.07 (0.75 to 1.54)1.00 (0.99 to 1.01)
 1-day lag0.99 (0.98 to 1.00)0.99 (0.98 to 1.01)0.92 (0.70 to 1.20)0.99 (0.98 to 1.01)
 3-day0.99 (0.98 to 1.00)0.99 (0.97 to 1.01)1.16 (0.78 to 1.71)0.92 (0.71 to 1.19)
O3
 Same-day99.50.80 (0.61 to 1.04)0.94 (0.68 to 1.30)1.12 (0.76 to 1.65)0.94 (0.62 to 1.44)
 1-day lag1.02 (0.77 to 1.36)0.91 (0.67 to 1.24)1.83 (1.16 to 2.87)*0.92 (0.59 to 1.42)
 3-day0.99 (0.69 to 1.42)0.94 (0.63 to 1.40)1.90 (1.06 to 3.42)*0.91 (0.59 to 1.41)
  • 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.