Table 1.
Cohort characteristics of maternal smoking at maternity booking usually in early pregnancy: Scottish births in period 1997–2009
| Cohort | Smoking at first booking | |||||
| N | Column % | Never smoked (row %) | Current smoker (row %) | Former smoker (row %) | Status unknown (row %) | |
| All woman | 697 003 | 100 | 56 | 23 | 9 | 12 |
| Babies gender | ||||||
| Male | 347 399 | 50 | 58 | 24 | 9 | 10 |
| Female | 330 241 | 47 | 58 | 24 | 9 | 10 |
| Missing | 19 363 | 3 | 0 | 0 | 0 | 100 |
| Maternal age (years) | ||||||
| Less than 20 | 55 843 | 8 | 36 | 41 | 11 | 11 |
| 20–24 | 127 265 | 18 | 44 | 34 | 10 | 12 |
| 25–29 | 186 949 | 27 | 57 | 22 | 9 | 11 |
| 30–34 | 202 008 | 29 | 64 | 16 | 8 | 12 |
| 35–39 | 103 457 | 15 | 65 | 15 | 7 | 13 |
| 40+ years | 18 848 | 3 | 64 | 16 | 6 | 14 |
| Invalid | 2633 | 0 | 0 | 0 | 0 | 100 |
| Area deprivation (quintiles) | ||||||
| Most deprived | 173 490 | 25 | 41 | 38 | 8 | 13 |
| 2 | 140 730 | 20 | 51 | 28 | 9 | 12 |
| 3 | 129 649 | 19 | 58 | 21 | 9 | 12 |
| 4 | 129 072 | 19 | 65 | 14 | 9 | 12 |
| Least deprived | 124 048 | 18 | 73 | 8 | 7 | 12 |
| Missing | 14 | 0 | 43 | 21 | 7 | 29 |
| Mother’s country of birth | ||||||
| Non-British | 57 334 | 8 | 69 | 9 | 6 | 17 |
| British | 639 647 | 92 | 55 | 24 | 9 | 12 |
| Not Known | 22 | 0 | 41 | 32 | 9 | 18 |
| Mother’s occupation | ||||||
| Managerial/professional | 187 513 | 27 | 71 | 9 | 7 | 13 |
| Intermediate | 156 848 | 23 | 63 | 15 | 9 | 12 |
| Semiroutine/routine | 200 774 | 29 | 46 | 33 | 10 | 11 |
| Students | 11 885 | 2 | 51 | 24 | 10 | 14 |
| Other/not known | 139 983 | 20 | 44 | 36 | 7 | 13 |
| Father’s occupation | ||||||
| Managerial/professional | 198 936 | 29 | 71 | 9 | 7 | 13 |
| Intermediate | 116 614 | 17 | 63 | 16 | 8 | 12 |
| Semiroutine/routine | 309 886 | 44 | 49 | 30 | 10 | 12 |
| Students | 7112 | 1 | 59 | 17 | 7 | 17 |
| Other/not known | 64 455 | 9 | 34 | 44 | 8 | 14 |
| Marital status | ||||||
| Cohabiting | 202 610 | 29 | 44 | 33 | 11 | 13 |
| Single/parents living apart | 113 254 | 16 | 34 | 44 | 9 | 13 |
| Married | 381 139 | 55 | 69 | 11 | 7 | 12 |
| Parity | ||||||
| No siblings/first child | 309 769 | 44 | 57 | 22 | 10 | 11 |
| One or more siblings | 363 374 | 52 | 59 | 25 | 7 | 9 |
| Other/unknown | 23 860 | 3 | 12 | 4 | 2 | 82 |
| Infant feeding at 6–8 weeks | ||||||
| Both | 46 877 | 7 | 65 | 13 | 8 | 14 |
| Bottle | 342 483 | 49 | 50 | 29 | 9 | 12 |
| Breast | 144 124 | 21 | 70 | 9 | 8 | 13 |
| Invalid/unknown | 163 519 | 23 | 55 | 25 | 9 | 12 |
| Mode of delivery | ||||||
| Normal/spontaneous | 440 632 | 63 | 56 | 26 | 9 | 9 |
| Instrumental/breech births | 85 143 | 12 | 61 | 19 | 10 | 10 |
| Caesarean (elective/emergency) | 151 537 | 22 | 60 | 20 | 9 | 11 |
| Other/unknown/no data recorded | 19 691 | 3 | 1 | 0 | 0 | 98 |
| Maternal religious background | ||||||
| Buddhist | 4186 | 1 | 72 | 3 | 4 | 22 |
| Christian | 663 563 | 95 | 55 | 24 | 9 | 12 |
| Hindu | 1848 | 0 | 75 | 5 | 2 | 18 |
| Jewish | 432 | 0 | 50 | 26 | 9 | 15 |
| Muslim | 18 057 | 3 | 79 | 4 | 2 | 15 |
| Sikh | 1697 | 0 | 82 | 3 | 2 | 14 |
| Non-applicable | 7220 | 1 | 58 | 18 | 7 | 17 |