Table 2.

Relative risks estimates of conjunctivitis for an increase from the 5th to the 95th percentile of a pollution variable adjusted on the day of the week. The univariate model is adjusted on the day of the week. The multivariate model includes all environmental covariates and the day of the week, the most significant of which are selected by a stepwise procedure

	Lag (days)	Univariate RR* P95/P5	95% CI†	Multivariate RR P95/P5	95% CI	Range P95/P5
NO	2	1.11, p=0.28	0.92 to 1.36			80/3
NO2	2	1.27, p=0.04	1.01 to 1.60	1.51, p=0.002	1.17 to 1.96	80/30
O3	0	1.13, p=0.28	0.90 to 1.42			74/5
SO2	1	0.88, p=0.31	0.70 to 1.12			27/2
PM10	2	1.20, p=0.11	0.96 to 1.49			388/101
Temperature (min)	1	0.94, p=0.57	0.77 to 1.15			0.7/17.6
Temperature (max)	3	0.95, p=0.58	0.78 to 1.15	1.29, p=0.007	1.07 to 1.56	5.3/29.8
Atmospheric pressure	2	1.11, p=0.35	0.90 to 1.36			1019.6/991.2
Humidity (min)	3	1.13, p=0.20	0.94 to 1.35			82/33
Humidity (max)	2	0.84, p=0.13	0.66 to 1.06			77/97
Average wind speed	0	1.10, p=0.28	0.92 to 1.31			5.0/1.6
Instant wind strength	0	1.12, p=0.15	0.96 to 1.31	1.17, p=0.03	1.02 to 1.36	19/6

*Relative risk.

†Confidence interval.