Effects of Incentive-Based Smoking Cessation Program for Pregnant Women on Birth Outcomes.

Matern Child Health J · 2017 · PMC5378728 · PMID 27473094

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failed to reach statistical significanceno p-value reported

Similar to our finding, a potential protective effect on preterm birth was also suggested in some trials, but the results failed to reach statistical significance (Higgins et al. 2012 ).

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