Table 4.

Association between concentration of phthalates in dust (> median) and building characteristics.

		Odds ratio (95% CI)a
Factor	No.	BBzPb	DEHPc
PVC as flooring
No	138	1.0	1.0
Yes	165	3.85 (2.37–6.24)	1.85 (1.15–2.98)
Vinyl as wall material
No	282	1.0	1.0
Yes	21	NS	NS
Type of building
Single-family house	277	1.0	1.0
Multifamily house	26	NS	NS
Construction period
Before 1960	144	NS	2.30 (1.17–4.52)
1960–1983	110	NS	1.09 (0.55–2.18)
After 1983	49	1.0	1.0
Ventilation rate in child’s bedroom
1st quartile	74	NS	NS
2nd quartile	79	NS	NS
3rd quartile	80	NS	NS
4th quartile	70	1.0	1.0
Water leakage during previous 3 years
No	227	1.0	1.0
Yes	76	1.84 (1.05–3.22)	NS

^aBackward conditional logistic regression in two different models. Only significant variables included in the final model; variables with no significant contribution to the model have been eliminated (NS).

^bModel 1: Dependent variable BBzP coded as 1 ≤median concentration and 2 > median concentration.

^cModel 2: Dependent variable DEHP coded as 1 ≤median concentration and 2 > median concentration.