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. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: Obstet Gynecol. 2011 Jan;117(1):136–142. doi: 10.1097/AOG.0b013e31820090e1
Failed Implantation: Positive β-hCG‡
n (%) Crude OR (95% CI) MV OR (95% CI)
1,832 (54.8) 1.00 (referent) 1.00 (referent)
   553 (58.4) 1.14 (0.98–1.32) 1.06 (0.92–1.24)
1,958 (55.2) 1.00 (referent) 1.00 (referent)
   411 (57.2) 1.08 (0.91–1.27) 1.07 (0.91–1.26)
1,840 (54.9) 1.00 (referent) 1.00 (referent)
   518 (58.1) 1.14 (0.98–1.33) 1.09 (0.94–1.27)
1,794 (54.0) 1.00 (referent) 1.00 (referent)
   552 (60.9) 1.30 (1.12–1.51) 1.22 (1.05–1.43)
2,249 (55.5) 1.00 (referent) 1.00 (referent)
   138 (57.0) 1.06 (0.81–1.37) 0.99 (0.76–1.30)