Table 3.
Zero-inflated Poisson model for number of wheezing events in the first two-years of life associated with prenatal exposure to PAHs, fine particulate matter and other potential risk factors
| IRR | P>z | [95% Conf. | Interval] | |
|---|---|---|---|---|
| Poisson portion | ||||
| Maternal age | ||||
| <=20 years | Reference | |||
| 20 – 30 years | 0.441 | 0.000 | 0.370 | 0.525 |
| >30 years | 0.435 | 0.000 | 0.340 | 0.557 |
| Maternal education | ||||
| Elementary | Reference | |||
| Secondary | 0.747 | 0.000 | 0.647 | 0.863 |
| Higher | 0.893 | 0.155 | 0.764 | 1.044 |
| Maternal atopy | 1.428 | 0.000 | 1.292 | 1.578 |
| Number of older siblings | 1.043 | 0.215 | 0.976 | 1.115 |
| Gender of child | 1.073 | 0.161 | 0.972 | 1.184 |
| Damp/mould | 1.429 | 0.000 | 1.265 | 1.614 |
| Cord blood PAH-adducts | 1.686 | 0.000 | 1.517 | 1.875 |
| Prenatal exposure to fine | 1.377 | 0.000 | 1.252 | 1.514 |
| particulate matter | ||||
| Logistic portion | 1/OR | |||
| Maternal age | 0.377 | 0.001 | 0.202 | 0.681 |
| Maternal education | 1,037 | 0.842 | 0.731 | 1.471 |
| Maternal atopy | 1.346 | 0.255 | 0.807 | 2.246 |
| Number of older siblings | 2.121 | 0.000 | 1.468 | 3.062 |
| Gender of child | 0.662 | 0.072 | 0.422 | 0.963 |
| Damp/mould | 1.441 | 0.294 | 0.728 | 2.852 |
| Cord blood PAH-adducts | 0.772 | 0.278 | 0.482 | 1.234 |
| Prenatal exposure to fine particulate matter |
1.324 | 0.225 | 0.841 | 2.083 |
| Constant | 0.779 | 0.744 | 0.174 | 3.483 |