Table 5.

Summary of hierarchical logistic regression analysis for variables predicting ORs for recurrent broncho-pulmonary infections (defined as five or more episodes) in the seven-year follow-up (N = 214)

Variables	OR	Pr>|z|	95% Confidence intervals		Wald Chi-square	df	Pr> F
Model I
Prenatal PM2.5 exposure a	2.00	0.026	1.09	3.70	4.97	1	0.0257
Model II
Prenatal PM2.5 exposure a	2.17	0.018	1.14	4.12	0.69	1	0.4063
Prenatal ETSb	0.78	0.406	0.43	1.40
Model III
Prenatal PM2.5 exposure a	2.22	0.015	1.17	4.23	0.43	1	0.5109
Prenatal ETSb	0.97	0.963	0.40	2.37
Postnatal ETSc	0.76	0.511	0.33	1.73
Model IV
Prenatal PM2.5 exposure a	2.20	0.017	1.15	4.19	0.22	1	0.6404
Prenatal ETSb	0.95	0.913	0.39	2.32
Postnatal ETSc	0.78	0.559	0.34	1.79
Atopy Y/N	1.26	0.640	0.48	3.26
Model V
Prenatal PM2.5 exposure a	2.10	0.028	1.08	4.06	8.08	1	0.0045
Prenatal ETSb	0.92	0.885	0.36	2.39
Postnatal ETSc	0.79	0.597	0.33	1.91
Atopy Y/N	1.19	0.715	0.45	3.17
Asthma Y/N	3.81	0.004	1.52	9.59
Model VI
Prenatal PM2.5 exposure a	2.05	0.035	1.05	3.99
Prenatal ETSb	0.93	0.885	0.36	2.39
Postnatal ETSc	0.79	0.597	0.33	1.91
Atopy Y/N	1.19	0.735	0.45	3.14
Asthma Y/N	3.87	0.004	1.53	9.75
Residenced	1.31	0.553	0.54	3.17	0.35	1	0.5525

^aln transformed concentrations

^b0: no prenatal ETS exposure, 1: up to 5 cigarettes smoked daily, 2 : more than 5 cigarettes smoked daily

^c0: no postnatal ETS exposure, 1: short exposure (<=3 years), 2: long exposure (>3 years)

^d0: outer city area residents, 1: city center residents