Table 2.

CL-RI of the treatment groups

	No. of patients	CL-RI	No. of patients with CL-RI < 0.51
Control	9	0.546 ± 0.013	2/9
HCG	8	0.475 ± 0.022b	7/8c
Vitamin E	7	0.431 ± 0.015a	7/7c

The table summarizes the data in Figure 1. Corpus luteum-resistance index (CL-RI) was measured during the mid-luteal phase in the control group, HCG group, and vitamin E group. The value shows the mean ± SEM from the patient mean value. In this study, when CL-RI was more than 0.51, the patient was diagnosed as having decreased luteal blood flow.

a; p < 0.01 and b; p < 0.05 v.s. control (Kruskal-Wallis test followed by the Mann-Whitney U-test using the Bonferroni correction). c; p < 0.01 v.s. control (x²-test with Bonferroni correction).