Table 4.

Percentage change with 95% CI in cardiac arrhythmia admissions associated with an IQR increases in PM_2.5 (47.5 μg/m³) and PM₁₀ (76.9 μg/m³) concentration for different lag structure

Lag Days	PM2.5			PM10
	Percentage Change	95% CI	p value	Percentage Change	95% CI	p value
Lag 0 days	1.50	0.98–2.02	< 0.001	1.56	0.92–2.19	< 0.001
Lag 1 days	1.89	1.37–2.40	< 0.001	1.91	1.27–2.55	< 0.001
Lag 2 days	2.09	1.58–2.60	< 0.001	2.33	1.68–2.97	< 0.001
Lag 3 days	1.48	0.97–2.00	< 0.001	2.15	1.52–2.79	< 0.001
Lag 4 days	0.00	−0.52 - 0.52	0.997	0.65	0.02–1.28	0.043
Lag 5 days	−0.36	−0.88 - 0.16	0.177	−0.10	−0.73 - 0.54	0.767
Lag 0–2 days	2.67	2.03–3.31	< 0.001	2.92	2.11–3.74	< 0.001
Lag 0–3 days	2.93	2.24–3.63	< 0.001	3.56	2.67–4.46	< 0.001
Lag 0–4 days	2.67	1.91–3.43	< 0.001	3.58	2.61–4.56	< 0.001
Lag 0–5 days	2.28	1.47–3.09	< 0.001	3.22	2.19–4.26	< 0.001

CI confidence interval, IQR interquartile range. The association was adjusted for temperature, relative humidity, public holidays and city-level confounders