Table 4.

ER (%) and 95% CI of children's outpatient visits in co-pollutant models.

Two-pollutant models		Estimates
CO	–	0.19 (0.15 to 0.24)*
	+NO2	0.08 (0.02 to 0.13)*
	+O3	0.19 (0.14 to 0.23)*
	+SO2	0.16 (0.11 to 0.21)*
	+PM10	0.15 (0.09 to 0.21)*
	+PM2.5	0.18 (0.12 to 0.24)*
NO2	–	2.46 (2.00 to 2.92)*
	+CO	2.01 (1.46 to 2.56)*
	+O3	2.73 (2.22 to 3.25)*
	+SO2	2.85 (2.21 to 3.50)*
O3	–	0.27 (0.07 to 0.46)*
	+CO	0.06 (−0.14 to 0.26)
	+NO2	−0.25 (−0.46 to −0.04)*
	+SO2	0.04 (−0.17 to 0.25)
	+PM10	−0.10 (−0.33 to 0.12)
	+PM2.5	−0.01 (−0.23 to 0.22)
SO2	–	7.16 (4.80 to 9.57)*
	+CO	3.51 (0.98 to 6.10)*
	+NO2	−2.64 (−5.59 to 0.39)
	+O3	6.98 (4.43 to 9.59)*
	+PM10	2.53 (−0.74 to 5.91)
	+PM2.5	4.82 (1.58 to 8.16)*
PM10	–	1.16 (0.83 to 1.49)*
	+CO	0.50 (0.09 to 0.92)*
	+O3	1.25 (0.87 to 1.63)*
	+SO2	0.89 (0.41 to 1.37)*
PM2.5	–	1.35 (0.88 to 1.82)*
	+CO	0.17 (−0.43 to 0.77)
	+O3	1.36 (0.83 to 1.89)*
	+SO2	0.65 (0 to 1.31)*

^*P < 0.05.