Table 4.
Zero-inflated Poisson model for number of days with difficult breathing in two- years olds due to prenatal air quality and other potential risk factors
| Poisson portion | IRR | p-value | [95% Conf. | Interval] |
|---|---|---|---|---|
| Age groups | ||||
| Age <=26 yrs | Reference | |||
| Age_27 – 29 yrs | 0.923 | 0.096 | 0.840 | 1.014 |
| Age_>29 yrs | 0.681 | 0.000 | 0.608 | 0.764 |
| Maternal education | ||||
| Elementary | Reference | |||
| Medium | 0.654 | 0.000 | 0.577 | 0.743 |
| Higher | 0.831 | 0.002 | 0.740 | 0.932 |
| Maternal atopy | 1.467 | 0.000 | 1.356 | 1.588 |
| Girls | 0.632 | 0.000 | 0.584 | 0.684 |
| Older siblings | 1.300 | 0.000 | 1.232 | 1.371 |
| Wheezing phenotypes | ||||
| No wheezing | Reference | |||
| Transient early wheeze | 1.602 | 0.000 | 1.455 | 1.764 |
| Transient late wheeze | 1.193 | 0.002 | 1.065 | 1.337 |
| Persistent wheezing | 1.325 | 0.000 | 1.188 | 1.477 |
| Prenatal PM2.5 | 1.174 | 0.000 | 1.123 | 1.227 |
| Moldy/damp house | 1.126 | 0.000 | 1.082 | 1.172 |
| Logistic portion | OR | p-value | [95% Conf. | Interval] |
| Age groups | −0.093 | 0.510 | −0.370 | 0.183 |
| Education levels | 0.052 | 0.746 | −0.263 | 0.367 |
| Maternal atopy | −.0.317 | 0.179 | −0.781 | 0.145 |
| Girls | −0.169 | 0.407 | −0.569 | 0.231 |
| Older siblings | −0.265 | 0.138 | −0.617 | 0.085 |
| Wheezing phenotypes | −0.847 | 0.000 | −1.107 | −0.585 |
| Prenatal PM2.5 | −0.072 | 0.559 | −0.314 | 0.170 |
| Moldy/damp house | −0.075 | 0.576 | −0.342 | 0.190 |
| _cons | 1.745 | 0.035 | 0.120 | 3.370 |
Age groups: <26 yrs, 27 – 29 yrs, >29 yrs)
Education level (elementary/medium/high)
Maternal atopy (Y/No)
Older siblings (number of older siblings: 0, 1, 2= two or more siblings)
Length at birth (cm)
Prenatal PM2.5 ((μg/m3) log-transformed to the basis 2
Moldy/damp house (Y/No)
Prenatal ETS (number of cigarettes smoked daily at home over pregnancy)
Postnatal ETS (number of cigarettes smoked daily at home in the postnatal period)