Table 1. Ovarian stimulation and IVF results in patients
Groups	Normal weight (n = 2222)	Overweight (n = 379)	Obesity (n = 27)	p value
Cycle cancellation	205 (9.2%)	22 (5.8%)	1 (3.7%)	> 0.05
Days of stimulation	10.42 ± 2.03	10.60 ± 2.16	11.89 ± 4.57*	< 0.001
Gn dose (IU)	2,587 ± 933	2,688 ± 966**	3272 ± 1798*	< 0.001*, < 0.05**
Peak E2 (pmol/L)	13,757 ± 10,212	11,307 ± 8,999	10290 ± 9048	> 0.05
Oocytes retrieved	14.49 ± 7.96	12.98 ± 6.91*	12.48 ± 5.89	< 0.001
Fertilised eggs	8.87 ± 5.96	7.72 ± 4.85*	6.78 ± 4.16	< 0.001
Fertilisation rate (%)	61.1 ± 23.0	60.8 ± 23.3*	54.1 ± 21.3*	< 0.001
Cleavaged embryos	8.67 ± 5.90	7.55 ± 4.86*	6.96 ± 4.25	< 0.001
High-grade embryos	5.59 ± 4.81	4.65 ± 3.96*	4.56 ± 2.94	< 0.001
Cryopreserved embryos	5.49 ± 5.55	4.44 ± 4.55*	3.81 ± 4.01	< 0.001
Numbers of embryos tranferred	2.15 ± 0.90	2.30 ± 0.84	2.19 ± 0.68	> 0.05
Continuous data were analysed using one-way ANOVA test, and post-hoc comparisons were performed using the LSD test. Chi-square test was used to assess the categorical variables. *p < 0.001, compared with the normal weight group. **p < 0.05, compared with the normal weight group. Adapted from Zhang et al., 2010.