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Table 4 Percentage increase of stroke risk associated with per 10 μg/m3 and per IQR increase of SO2 under single and two-pollutant models

From: Association of short-term exposure to sulfur dioxide and hospitalization for ischemic and hemorrhagic stroke in Guangzhou, China

Age groupPollutantModel typeIschemic strokeaHemorrhagic stroke#
per 10 μg/m3 (95%CI)per IQR (95%CI)per 10 μg/m3 (95%CI)per IQR (95%CI)
All ageSO2Single pollutant1.27 (0.42–2.12)2.75 (0.90–4.63)1.55 (0.02–3.11)3.38 (0.04–6.82)
Two-pollutant
SO2 + NO21.34 (0.31–2.37)2.90 (0.66–5.20)1.25 (− 0.48 - 3.01)2.72 (− 1.04 - 6.62)
SO2 + PM101.21 (0.18–2.26)2.64 (0.39–4.94)0.89 (− 0.89 - 2.7)1.93 (− 1.91 - 5.91)
SO2 + PM2.52.25 (0.06–4.48)4.91 (0.12–9.93)2.71 (− 1.39 - 6.98)5.94 (− 2.98 - 15.68)
SO2 + O32.68 (0.75–4.65)5.88 (1.63–10.3)4.32 (0.63–8.15)9.56 (1.36–18.43)
< 65 yearsSO2Single pollutant1.39 (0.35–2.45)3.03 (0.75–5.36)1.47 (− 0.18 - 3.16)3.21 (− 0.39 - 6.93)
Two-pollutant
SO2 + NO21.59 (0.36–2.83)3.46 (0.78–6.21)1.07 (− 0.8 - 2.97)2.32 (− 1.71 - 6.51)
SO2 + PM101.22 (− 0.02 - 2.47)2.64 (− 0.04 - 5.40)1.37 (− 0.55 - 3.33)2.98 (− 1.18 - 7.32)
SO2 + PM2.52.23 (− 0.39 - 4.93)4.88 (− 0.85 - 10.94)3.94 (− 0.58 - 8.68)8.71 (− 1.25 - 19.67)
SO2 + O33.70 (1.36–6.09)8.15 (2.95–13.60)4.45 (0.38–8.69)9.85 (0.82–19.69)
≥65 yearsSO2Single pollutant1.21 (0.02–2.42)2.64 (0.05–5.30)0.25 (− 2.79 - 3.40)0.55 (− 5.93 - 7.48)
Two-pollutant
SO2 + NO21.09 (− 0.32 - 2.51)2.36 (− 0.69 - 5.51)0.67 (− 2.79 - 4.26)1.45 (− 5.93 - 9.42)
SO2 + PM101.19 (− 0.23 - 2.63)2.58 (− 0.5 - 5.75)− 1.21 (− 4.71 - 2.41)−2.6 (− 9.89 - 5.28)
SO2 + PM2.52.19 (− 0.49 - 4.94)4.78 (− 1.06 - 10.96)− 0.96 (− 8.36 - 7.03)− 2.06 (− 17.17 - 15.8)
SO2 + O31.90 (− 0.45 - 4.31)4.14 (− 0.98 - 9.52)1.62 (− 5.14 - 8.85)3.52 (− 10.76 - 20.08)
  1. Abbreviations: IQR interquartile increase; NO2 nitrogen dioxide; O3 ozone; PM10 particulate matter with aerodynamic diameter less than 10 μm; PM2.5 particulate matter with aerodynamic diameter less than 2.5 μm; SO2 sulfur dioxide
  2. Ischemic strokea: models were based on lag 0 (maximum effect day in single model). Hemorrhagic stroke#: models were based on lag 1 (maximum effect day in single model)
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