Table 1 Parental smoking prevalence rates at different times over the childbearing period
| Â | Smoking prevalence rate | |||
|---|---|---|---|---|
| Â | Mothers | Fathers | ||
Period | Smokers | % | Smokers | % |
First child | N = 3,109 | N = 3,109 | ||
   In the six months right before this pregnancy | 129 | 4.15 | 1862 | 59.89 |
   During this pregnancy | 103 | 3.31 | 1844 | 59.31 |
   In the child's infancy | 122 | 3.92 | 1845 | 59.34 |
Second child | N = 2,591 | N = 2,591 | ||
   In the six months right before this pregnancy | 90 | 3.47 | 1548 | 59.75 |
   During this pregnancy | 78 | 3.01 | 1539 | 59.40 |
   In the child's infancy | 94 | 3.63 | 1546 | 59.67 |
Third child or later | N = 1,072 | N = 1,071 | ||
   In the six months right before this pregnancy | 44 | 4.10 | 692 | 64.61 |
   During this pregnancy | 37 | 3.45 | 687 | 64.15 |
   In the child's infancy | 44 | 4.10 | 687 | 64.15 |