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. Author manuscript; available in PMC: 2013 Jun 1.
Published in final edited form as: Obstet Gynecol. 2012 Jun;119(6):1143–1150. doi: 10.1097/AOG.0b013e318257217a

Table 4.

Differences in Vaginal Bleeding (Days) by Treatment Group Based on Poisson Regression Models

Continuous Cyclic Continuous Compared With
Cyclic
Mean (95% CI) Mean (95% CI) Rate Ratio
(95% CI)
P
All bleeding (days) 58.2 (43.8,77.2) 33.7 (23.6,47.9) 1.7 (1.1,2.7) 0.02
Moderate-to-heavy bleeding (days) 16.7 (10.5,26.5) 17.6 (11.5,27.0) 0.9 (0.5,1.8) 0.87
Spotting (days) 41.5 (29.3,58.8) 16.0 (9.4,27.3) 2.6 (1.4,4.9) 0.003