Table 3.

Increases in outpatient visits for psoriasis associated with a 10-μg/m³ increase in levels of airborne fine particulate matter for various lags.

Lag day	Percentage change	95% confidence interval	P
Lag 0 day	0.29	0.26–0.32	<0.001
Lag 1 day	0.02	−0.01–0.05	0.428
Lag 2 day	0.11	0.09–0.14	<0.001
Lag 3 day	0.10	0.08–0.12	<0.001
Lag 0–1 days	0.20	0.17–0.23	<0.001
Lag 0–2 days	0.23	0.19–0.26	<0.001
Lag 0–3 days	0.24	0.21–0.28	<0.001