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. Author manuscript; available in PMC: 2016 Mar 11.
Published in final edited form as: JAMA. 2015 Sep 8;314(10):1039–1051. doi: 10.1001/jama.2015.10244

Adjusted RR (95% CI) for the change per year
23 weeks 24 weeks 25 weeks

1.00 (0.95–1.05) 0.99 (0.97–1.01) 1.02 (1.01–1.03)

26 weeks 27 weeks 28 weeks

1.02 (1.01–1.03) 1.02 (1.02–1.03) 1.03 (1.02–1.03)