Table 1.

Comparison of demographic and clinical characteristics of the five groups.

	Age < 32	32 ≤ age ≤ 34	35 ≤ age ≤ 36	37 ≤ age ≤ 38	38 ≤ age ≤ 40	age > 40	P
No. of cases	4894	982	539	345	197	132
Male age (year)	29.58 ± 3.52	34.02 ± 3.43	35.73 ± 3.84	37.95 ± 3.78	39.72 ± 4.24	42.49 ± 4.49	< 0.001
Male BMI	25.20 ± 3.82	25.64 ± 3.68	25.73 ± 3.46	25.61 ± 3.23	25.81 ± 3.23	25.44 ± 3.39	< 0.001
BMI	23.04 ± 3.74	23.06 ± 3.61	23.52 ± 3.41	23.21 ± 3.19	23.72 ± 2.88	23.82 ± 3.21	0.002
Infertility year	3.08 ± 2.09	3.94 ± 2.81	4.53 ± 3.67	4.43 ± 4.00	4.23 ± 3.70	4.98 ± 4.77	< 0.001
Infertility type (%)							< 0.001
Primary infertility	2305 (47.11%)	660 (67.28%)	405 (75.28%)	287 (83.19%)	177 (89.85%)	124 (93.94%)
Secondary infertility	2588 (52.89%)	321 (32.72%)	133 (24.72%)	58 (16.81%)	20 (10.15%)	8 (6.06%)
Infertility factors (%)							< 0.001
Pelvic or tubal factor	51.2	63	64.7	59.7	60.9	54.5
Ovary factor	3.5	3	2.8	1.7	4.1	2.3
Uterine or cervix factor	33.5	24.3	22.8	27.5	25.9	28
Endometriosis	0.8	0.3	0.6	0.9	0.5	0.8
Male factor	8.2	7.3	6.3	6.4	7.1	6.8
Other factors	2.7	2	2.8	3.8	1.5	7.6
AMH (ng/ml)	5.29 ± 3.91	4.26 ± 3.14	3.83 ± 2.93	3.40 ± 2.83	2.76 ± 2.23	2.29 ± 2.22	< 0.001
Basal AFC	16.53 ± 6.21	14.36 ± 6.02	13.22 ± 5.76	11.52 ± 5.68	10.12 ± 5.31	8.09 ± 5.53	< 0.001

Male age and male BMI are defined as the age and BMI of male infertility patients.