Table 3.

Estimates of the logistic regression models (associations between PM_2.5, NO₂, BC, and stroke) and potential impact fractions (PIFs) for the different air pollution reduction scenarios

Stroke baseline prevalence 1.33% 95% CI [1.14;1.51]		PM2.5	NO2	BC
OR [95% CI] (for 1 IQR increase)		1.69 [1.06;2.69]	1.35 [0.91;1.99]	1.17 [0.99;1.39]
WHO guideline threshold	RD (%) [95% CI]	−0.88 [−1.35;−0.41]	−0.33 [−0.71;0.04]
	PIF (%) [95% CI]	67.08 [19.77;86.12]	25.21 [−4.06;54.48]
−20%	RD (%) [95% CI]	−0.39 [−0.68;−0.10]	−0.13 0.30;0.03]	−0.11 [−0.22;0.01]
	PIF (%) [95% CI]	29.10 [5.70;48.52]	9.63 [−4.02;22.3]	7.60 [−1.87;15.25]
−40%	RD (%) [95% CI]	−0.67 [−1.10;−0.22]	−0.26 [−0.56;0.05]	−0.20 [−0.41;0.01]
	PIF (%) [95% CI]	48.07 [9.42;73.29]	18.44 [−7.29;39.22]	14.15 [−3.88;27.56]
−60%	RD (%) [95% CI]	−0.86 [−1.35;−0.36]	−0.36 [−0.56;0.05]	−0.29 [−0.58;0.01]
	PIF (%) [95% CI]	61.47 [14.78;85.69]	25.38 [−11.6;52.36]	20 [−5.98;37.7]
−80%	RD (%) [95% CI]	−0.99 [−1.52;−0.45]	−0.46 [−0.98;0.06]	−0.34 [−0.75;0.01]
	PIF (%) [95% CI]	69.70 [16.59;92.11]	31.24 [−18.04;61.7]	22.76 [−13.5;45.96]

RD, risk difference, PIF, potential impact fraction, WHO, World Health Organization, CI, confidence interval, IQR, interquartile range