Table 4.

Regression analysis of hospitalization rates for asthma by age group.

	All Ages		0–14		15–64		65 and Over
	Coefficient	SE	Coefficient	SE	Coefficient	SE	Coefficient	SE
Baseline (intercept)	14.613	4.609	26.996	19.653	9.226	2.403	46.322	10.030
Average NHI premium per household	−0.050	0.040	−0.060	0.171	−0.050 *	0.021	−0.156	0.087
Primary care physicians per 10,000 population	−1.901 ***	0.468	−5.038 *	1.995	−0.959 ***	0.244	−4.833 ***	1.018
Hospital beds per 1000 population (<300)	1.693 ***	0.216	4.721 ***	0.921	0.945 ***	0.113	3.036 ***	0.470
Hospital beds per 1000 population (>300)	0.032	0.189	0.265	0.808	0.022	0.099	−0.068	0.412
Annual average ambient concentration of CO	−11.566 *	4.974	−35.749	21.211	−5.868 *	2.594	−27.768 *	10.825
Annual average ambient concentration of SO2 (X100)	8.961 *	3.752	36.375 *	15.999	3.155	1.956	14.193	8.166
Annual average ambient concentration of PM10	0.013	0.076	−0.059	0.326	0.019	0.040	0.090	0.166
Adjusted R2	0.293		0.155		0.343		0.295

* p < 0.05, *** p < 0.001.