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Table 2 Gestational weight gain patterns by smoking status

From: Are women who quit smoking at high risk of excess weight gain throughout pregnancy?

  Women who never smoked
(N = 405/ 1,205a)
Women who quit smoking
(N = 61/ 179a)
Women who continued to smoke
(N = 43/ 119a)
Unadjusted
 1st trimester
 Total trimester weight gain, kg, (95 % CI) 1.7 (1.4, 2.1) 1.2 (0.3, 2.1) 3.5 (2.4, 4.6)
 Mean difference, kg (95 % CI) Reference −0.5 (−1.5, 0.5) 1.8 (0.6, 3.0)
 2nd and 3rd trimester
 Rates of weight gain, kg/week, (95 % CI) 0.49 (0.47, 0.51) 0.60 (0.54, 0.65) 0.40 (0.32, 0.45)
 Mean difference, kg/week (95 % CI) Reference 0.11 (0.05, 0.17) −0.10 (−0.17,−0.03)
Adjustedb
 1st trimester
 Total trimester weight gain, kg, (95 % CI) 2.3 (1.5, 3.2) 1.7 (0.5, 2.8) 4.7 (3.2, 6.2)
 Mean difference, kg (95 % CI) Reference −0.7 (−1.7, 0.4) 2.4 (1.1, 3.7)
 2nd and 3rd trimester
 Rates of weight gain, kg/week, (95 % CI) 0.51 (0.46, 0.55) 0.59 (0.53, 0.66) 0.42 (0.34, 0.50)
 Mean difference, kg/week (95 % CI) Reference 0.09 (0.03, 0.15) −0.09 (−0.16,−0.01)
  1. Abbreviation(s): CI confidence interval
  2. aN represents the number of participants/measurements
  3. bEstimates are for a 30-year old, Caucasian, nulliparous, married woman with some college or university education, a household income between $20,000 and $80,000, and a normal BMI