Table 1 Comparison of demographic and clinical characteristics among the three groups
Item EMT≤7.5 mm EMT 7.6-12 mm EMT 12> mm P value
No. of cases 181 1714 952
Maternal age (year) 30(28,35) 29(27,33) 29(27,33) 0.12
Body mass index(kg/m2) 23.4(20.8,25.0) 22.7(20.7,25.0) 22.8(20.9,25.3) 0.46
Duration of infertility (year) 3.0(1.5,4.0) 3.0(2.0,5.0) 3.0(2.0,5.0) 0.29
Type of infertility 0.25
Primary infertility 50.3 (91/181) 48.4 (829/1714) 45.4 (432/952)
Secondary infertility 49.7 (90/181) 51.6 (885/1714) 54.6 (520/952)
Infertility diagnosis 0.06
Tubal factor 38.1 (69/181) 40.7(698/1714) 35.0 (333/952)
Male factor 26.5 (48/181) 24.0 (411/1714) 27.0 (257/952)
Others 35.4 (64/181) 35.3 (605/1714) 38.0 (362/952)
Basal FSH(IU/L) 6.6(5.2,7.8) 6.7(5.5,8.1) 6.8(5.6,8.0) 0.33
Number of antral follicle count 15(10,18) 15(11,19) 15(11,19) 0.47
Methods of ART (%) 0.07
IVF 73.5(133/181) 73.0 (1251/1714) 68.9 (656/952)
ICSI 26.5 (48/181) 27.0 (463/1714) 31.1 (296/952)
COH protocols (%) 0.88
GnRH-a protocol 70.7(128/181) 71.8(1230/1714) 70.9(675/952)
GnRH-anti protocol 29.3(53/181) 28.2(484/1714) 29.1(277/952)
Duration of ovarian stimulation (d) 12(10,14) 13(12,15) 13(12,15) 0.17
Dosage of gonadotropins(IU) 2550(2025,3562) 2475(1950,3300) 2475(1900,3300) 0.87
Serum estradiol on the trigger day (pg/ml) 3003.0(1966.5,4532.5) 3077.9(2097.5,4607.3) 3190.5(3123.5,4677.3) 0.39
No. of oocytes retrieved 10(7,13) 11(8,13) 11(8,14) 0.10
Note: Data are presented as median (P25,P75) for continuous variable and n (%) for categorical variable Note: Data are presented as median (P25,P75) for continuous variable and n (%) for categorical variable Note: Data are presented as median (P25,P75) for continuous variable and n (%) for categorical variable Note: Data are presented as median (P25,P75) for continuous variable and n (%) for categorical variable Note: Data are presented as median (P25,P75) for continuous variable and n (%) for categorical variable