Table 1

Cohort characteristics of maternal smoking at maternity booking usually in early pregnancy: Scottish births in period 1997–2009

CohortSmoking at first booking
NColumn %Never smoked (row %)Current smoker (row %)Former smoker (row %)Status unknown (row %)
All woman697 0031005623912
Babies gender
 Male347 399505824910
 Female330 241475824910
 Missing19 3633000100
Maternal age (years)
 Less than 2055 843836411111
 20–24127 2651844341012
 25–29186 949275722911
 30–34202 008296416812
 35–39103 457156515713
 40+ years18 84836416614
 Invalid26330000100
Area deprivation (quintiles)
 Most deprived173 490254138813
 2140 730205128912
 3129 649195821912
 4129 072196514912
 Least deprived124 04818738712
 Missing1404321729
Mother’s country of birth
 Non-British57 3348699617
 British639 647925524912
 Not Known2204132918
Mother’s occupation
 Managerial/professional187 51327719713
 Intermediate156 848236315912
 Semiroutine/routine200 7742946331011
 Students11 885251241014
 Other/not known139 983204436713
Father’s occupation
 Managerial/professional198 93629719713
 Intermediate116 614176316812
 Semiroutine/routine309 8864449301012
 Students711215917717
 Other/not known64 45593444814
Marital status
 Cohabiting202 6102944331113
 Single/parents living apart113 254163444913
 Married381 139556911712
Parity
 No siblings/first child309 7694457221011
 One or more siblings363 37452592579
 Other/unknown23 8603124282
Infant feeding at 6–8 weeks
 Both46 87776513814
 Bottle342 483495029912
 Breast144 12421709813
 Invalid/unknown163 519235525912
Mode of delivery
 Normal/spontaneous440 63263562699
 Instrumental/breech births85 1431261191010
 Caesarean (elective/emergency)151 537226020911
 Other/unknown/no data recorded19 691310098
Maternal religious background
 Buddhist41861723422
 Christian663 563955524912
 Hindu18480755218
 Jewish43205026915
 Muslim18 0573794215
 Sikh16970823214
 Non-applicable722015818717