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Percentage of smokers in the intervention and control groups from pregnancy to one year postpartum. Early pregnancy: IG: n = 47/931, CG: n = 46/922; late pregnancy: IG: n = 35/916, CG: n = 46/906; 6–8 weeks postpartum: IG: n = 64/905, CG: n = 88/910; one year postpartum: IG: n = 103/785, CG: n = 109/772. * p < 0.001.
