Table 4. Pregnancy rates of the patients depending on the compaction status and transfer day of the embryo (positive βhCG meaning serum βhCG≥10 mIU/ml). Pearson's Chi-squared test was used to analyze the differences for significance.

βhCG: beta human chorionic gonadotropin

	Early compaction group	Control group	p
Positive βhCG following 3. day embryo transfer (n, %)	128 (%68.8)	111 (%58.7)	0.042*
Positive βhCG following 5. day embryo transfer (n, %)	157 (%77.3)	157 (%79.3)	0.635
Positive βhCG (n, %)	285 (%73.3)	268 (%69.3)	0.217