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The average concentration of beta-hCG in pregnant group and non-pregnant groupa
| Day 3 | Day 5 | |||
|---|---|---|---|---|
| Pregnant (n = 18) | Non-pregnant (n = 26) | Pregnant (n = 15) | Non-pregnant (n = 18) | |
| beta-hCG (mIU/ml) | 0.58[0.45,0.72] | 0.39[0.36,0.42] | 1.92[1.63,2.22] | 1.32[1.03,1.60] |
| P value | 0.041 | 0.004 | ||
aThe data were expressed as mean and 95%CI
