Table 5.
Zero-inflated Poisson model for number of days with pharyngitis/tonsillitis 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 | 1.099 | 0.007 | 1.026 | 1.178 |
| Age_>29 yrs | 0.861 | 0.001 | 0.790 | 0.938 |
| Maternal education | ||||
| Elementary | Reference | |||
| Medium | 0.784 | 0.000 | 0.712 | 0.864 |
| Higher | 0.757 | 0.000 | 0.693 | 0.828 |
| Maternal atopy | 1.194 | 0.000 | 1.120 | 1.273 |
| Girls | 0.893 | 0.000 | 0.843 | 0.946 |
| Older siblings | 1.213 | 0.000 | 1.159 | 1.269 |
| Wheezing phenotypes | ||||
| No wheezing | Reference | |||
| Transient early wheeze | 1.036 | 0.445 | 0.945 | 1.135 |
| Transient late wheeze | 1.225 | 0.000 | 1.118 | 1.342 |
| Persistent wheezing | 1.085 | 0.113 | 0.980 | 1.201 |
| Prenatal PM2.5 | 1.105 | 0.000 | 1.068 | 1.143 |
| Moldy/damp house | 1.116 | 0.000 | 1.084 | 1.149 |
| Logistic portion | OR | p-value | [95% Conf. | Interval] |
| Age groups | 0.46 | 0.275 | −0.116 | 0.354 |
| Education levels | −0.044 | 0.771 | −0.343 | 0.620 |
| Maternal atopy | −0.158 | 0.488 | −0.604 | 0.288 |
| Girls | −0.272 | 0.159 | −0.652 | 0.107 |
| Older siblings | −0.355 | 0.039 | −0.692 | −0.018 |
| Wheezing phenotypes | −0.080 | 0.470 | −0.298 | 0.138 |
| Prenatal PM2.5 | −0.097 | 0.402 | −0.326 | 0.131 |
| Moldy/damp house | −0.218 | 0.120 | −0.492 | 0.056 |
| _cons | 1.055 | 0.178 | −0.480 | 2.592 |
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)