Table 1

Characteristics of pregnant women and their newborn infants according to exposure to cigarette smoke during pregnancy
Maternal characteristics continuous and binary Maternal smoking status during pregnancy
Non-smoking (n=460) Smoking (n=83) P-value
Maternal age, mean (SD), years 29.0 (5.0) 26.4 (5.7) < 0.001
Maternal height, mean (SD), cm 167.6 (5.7) 167.3 (7.2) 0.703
Maternal weight, mean (SD), kg 75.3 (12.5) 77.4 (15.2) 0.250
BMI, mean (SD) 26.8 (4.3) 27.6 (4.8) 0.136
Gestational age, mean (SD), weeks 38.9 (2.2) 38.9 (2.2) 0.979
Birthweight, mean (SD), g 3399.0 (639.2) 3284.1 (632.5) 0.132
Birth length, mean (SD), cm 51.3 (3.1) 50.8 (3.5) 0.150
Infant sex, n (%)
  male 245 (53.3) 47 (56.6) 0.737
  female 213 (46.3) 36 (43.4)
Education, n (%)
  university, college 437 (95.0) 53 (63.9) <0.001
  ≤ 12 years 23 (5.0) 30 (36.1)
Marital status, n (%)
  married 377 (82.0) 40 (48.2) <0.001
  not married 83 (18.0) 43 (51.8)
Parity, n (%)
  1st 217 (47.2) 38 (45.8) 0.905
  2nd and more 243 (52.8) 45 (54.2)
Miscarriage, n (%)
  no prior 369 (80.2) 70 (84.3) 0.450
  yes 91 (19.8) 13 (15.7)
Blood pressure, n (%)
  < 120/80 mm/Hg 324 (70.4) 56 (67.5) 0.604
  > 120/80 mm/Hg 136 (29.6) 27 (32.5)
Stress, n (%)
  no 379 (82.4) 64 (77.1) 0.281
  yes 81 (17.6) 19 (22.9)
Ethnic group, n (%)
  Lithuanian 441 (95.9) 80 (96.4) 0.571
  other 19 (4.1) 3 (3.6)
Passive smoking
  Yes 235 (50.4) 75 (91.0) <0.001
  No 225 (49.6) 8 (9.0)
GSTT1, n (%)
  present 389 (84.6) 61 (73.5) 0.018
  null 71 (15.4) 22 (26.5)
GSTM1, n (%)
  present 244 (53.0) 49 (59.0) 0.340
  null 216 (47.0) 34 (41.0)

SD standard deviation of the variability of individual observations.

Danileviciute et al.

Danileviciute et al. BMC Pregnancy and Childbirth 2012 12:161   doi:10.1186/1471-2393-12-161

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