Table 1.

Patient demographics, gonadotropin dosages, number of oocytes retrieved and endometrial thickness at the time of oocyte retrieval in the three treatment groups included in this study

	20%*	20%-5%	5%	P value
# of Cycles	1131	1258	1095
Age (Years)	31.36 ± 4.96	31.38 ± 4.87	31.29 ± 4.45	> 0.05
Infertility duration (Years)	4.79 ± 4.02	4.69 ± 4.31	4.76 ± 4.15	> 0.05
BMI (kg/m2)	21.82 ± 2.42	21.63 ± 2.34	21.79 ± 2.00	> 0.05
Initial dose of Gna (bolus)	2.55 ± 0.42	2.52 ± 0.44	2.53 ± 0.41	> 0.05
Total dose of Gn (bolus)	33.45 ± 13.61	34.01 ± 13.48	33.76 ± 3.77	> 0.05
Oocytes retrieved	11.56 ± 6.78	11.88 ± 6.54	11.72 ± 5.99	> 0.05
Endometrial thickness (mm)	9.86 ± 3.44	10.02 ± 3.02	9.91 ± 3.59	> 0.05
Number of embryos transferred	2.10 ± 0.19	2.10 ± 0.15	2.11 ± 0.21	> 0.05

^*20% = gametes and embryos incubated throughout in a 5% CO₂ in air (20% O₂) atmosphere;

20%-5% = same for gametes and zygotes but day embryos transferred to a 5% CO₂, 5% O₂ and 90% N₂ atmosphere; 5% gametes and embryos cultured in a 5% CO₂, 5% O₂ and 90% N₂ atmosphere. There were no differences among treatment groups (P > 0.05).

^aGn = gonadotropin.