TABLE 2.
PREVALENCE OF CIGARETTE SMOKING BY SEX, EXPOSURE TO MATERNAL SMOKING DURING PREGNANCY, AND ATOPIC STATUS AT STUDY ENTRY, CHILDREN'S HEALTH STUDY 1993–2003
| Entire Cohort | Sex
|
Maternal Smoking during Pregnancy*
|
Allergy†
|
||||
|---|---|---|---|---|---|---|---|
| N (%) | Female N (%) | Male N (%) | Yes N (%) | No N (%) | Positive N (%) | Negative N (%) | |
| Any lifetime smoking | 730 (28.0) | 357 (25.2) | 373 (31.2) | 106 (29.3) | 594 (27.4) | 237 (27.5) | 491 (28.2) |
| Amount smoked weekly | |||||||
| 1–6 cigarettes | 179 (6.9) | 78 (5.5) | 101 (8.5) | 16 (4.4) | 152 (7.0) | 53 (6.2) | 126 (7.2) |
| 7+ cigarettes | 180 (6.9) | 91 (6.4) | 89 (7.4) | 37 (10.2) | 135 (6.2) | 57 (6.6) | 122 (7.0) |
| Amount smoked yearly | |||||||
| 1–99 cigarettes | 525 (20.1) | 253 (17.9) | 272 (22.8) | 71 (19.6) | 433 (19.5) | 173 (20.1) | 351 (20.1) |
| 100–299 cigarettes | 68 (2.6) | 36 (2.5) | 32 (2.7) | 10 (2.8) | 57 (2.5) | 25 (2.9) | 43 (2.5) |
| 300+ cigarettes | 134 (5.1) | 66 (4.7) | 68 (5.7) | 24 (6.6) | 102 (4.1) | 37 (4.3) | 96 (4.3) |
| Total | 2,609 | 1415 | 1194 | 362 | 2165 | 862 | 1741 |
*
History on maternal smoking during pregnancy was unknown for 82 subjects.
†
Atopic status was defined by presence or absence of history of allergy, allergic rhinitis, or hay fever at study entry. Information on atopic status was unavailable for six children.