Table 3.
Zero-inflated Poisson model for number of days with coughing 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 | Reference | |||
| Age_27 – 29 | 0.967 | 0.106 | 0.929 | 1.007 |
| Age_>29 | 0.791 | 0.000 | 0.754 | 0.830 |
| Maternal education | ||||
| Elementary | Reference | |||
| Medium | 0.943 | 0.038 | 0.892 | 1.000 |
| Higher | 0.767 | 0.000 | 0.728 | 0.809 |
| Maternal atopy | 1.132 | 0.000 | 1.091 | 1.175 |
| Girls | 1.026 | 0.111 | 0.993 | 1.061 |
| Older siblings | 1.259 | 0.000 | 1.227 | 1.291 |
| Wheezing phenotypes | ||||
| No wheezing | Reference | |||
| Transient early wheeze | 1.612 | 0.000 | 1.540 | 1.688 |
| Transient late wheeze | 1.514 | 0.000 | 1.438 | 1.593 |
| Persistent wheezing | 2.137 | 0.000 | 2.032 | 2.248 |
| Prenatal PM2.5 | 1.032 | 0.001 | 1.012 | 1.052 |
| Moldy/damp house | 1.088 | 0.000 | 1.068 | 1.108 |
| Logistic portion | OR | p-value | [95% Conf. | Interval] |
| Age groups | −0.429 | 0.358 | −1.344 | 0.485 |
| Education levels | −0.169 | 0.799 | −1.470 | 1.132 |
| Maternal atopy | 0.185 | 0.630 | −0.567 | 0.937 |
| Girls | 0.172 | 0.603 | −0.476 | 0.819 |
| Older siblings | −0.379 | 0.240 | −1.011 | 0.252 |
| Wheezing phenotypes | −1.279 | 0.012 | −2.279 | −0.280 |
| Prenatal PM2.5 | −0.286 | 0.172 | −0.696 | 0.124 |
| Moldy/damp house | −0.238 | 0.403 | −0.795 | 0.319 |
| _cons | −0.286 | 0.837 | −3.001 | 2.429 |
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)