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. Author manuscript; available in PMC: 2013 Jul 1.
Published in final edited form as: Am J Obstet Gynecol. 2012 Apr 28;207(1):39.e1–39.e6. doi: 10.1016/j.ajog.2012.04.022

Table 2.

Mean EthinylEstradiol and Etonorgestrel Levels During Contractive Vaginal Ring Use

Normal Weight
Mean (ng/L ± SD1)
Obese
Mean (ng/L ± SD)
p-value
EE
 Week 1 21.8 (17.5, 27.1) 14.8 (12.5, 17.5) 0.008
 Week 2 23.5 (19.6, 28.2) 14.9 (12.5, 17.8) 0.001
 Week 3 21.9 (17.9, 26.6) 14.8 (12.7, 17.3) 0.004
ENG
 Week 1 1349 (1179, 1542) 1190 (968, 1464) 0.35
 Week 2 1360 (1196, 1547) 1311 (1106, 1553) 0.75
 Week 3 1275 (1116, 1457) 1240 (1041, 1477) 0.39