Table 1.

Characteristics of the patients in all groups

Group	Cycle number	Women’s age (year)	Infertility period (year)	Basal FSH (U/L)	Endometrial thickness (mm)	Peak E2 (nmol/L)	Retrieved oocytes	Injected MII oocyte
1	288	31.6±4.2	5.1±3.4	6.8±2.2	11.1±2.4	13 111.0±9 608.1	13.9±7.6	11.4±6.5
2	329	31.9±3.9	5.2±3.3	6.7±2.1	11.1±2.5	12 614.8±8 483.3	14.1±7.6	11.4±6.7
3	522	31.6±4.0	5.1±3.3	6.7±1.9	11.0±2.3	12 840.1±8 271.6	13.8±7.0	11.1±6.0
4	332	31.0±4.0*	4.8±3.2	6.7±1.9	11.2±2.3	13 308.4±9 200.2	15.0±8.4	12.1±6.8
5	171	30.2±3.7Δ	4.9±3.3	6.5±1.8	11.4±2.2	12 722.0±7 771.6	14.9±8.7	12.1±7.2
6	250	30.1±3.9†	4.6±3.2‡	6.5±2.0	11.4±2.4*	13 860.9±7 585.7Δ	15.2±7.5*	12.4±6.4
7	80	31.2±3.9	6.0±3.6#	6.6±1.9	11.6±2.6*	13 222.5±8 623.9	14.7±7.2	12.3±6.5

All values (except those for cycle number) are expressed as mean±SD

^* P<0.05: significant difference compared with Groups 1, 2, and 3

^Δ P<0.05: significant difference compared with Groups 1, 2, 3, and 4

^† P<0.05: significant difference compared with Groups 1, 2, 3, 4, and 7

^‡ P<0.05: significant difference compared with Groups 1, 2, 3, and 7

^# P<0.05: significant difference compared with Groups 1, 3, 4, 5, and 6 (rank transform method)