Table 1.
Characteristics of the patients
| Characteristics | Total (n = 387) |
Primary infertility (n = 258) |
Secondary infertility (n = 129) |
P |
|---|---|---|---|---|
| Age (years), mean ± SD | 33.9 ± 5.7 | 31.4 ± 3.8 | 38.8 ± 5.7 | < 0.001 |
| BMI (kg/m2), mean ± SD | 24.5 ± 3.2 | 24.3 ± 3.1 | 24.9 ± 3.4 | 0.05 |
| Monthly income (RMB), n (%) | 0.001 | |||
| 0-5000 | 10 (2.6) | 9 (3.5) | 1 (0.8) | |
| 5001-10,000 | 44 (11.4) | 30 (11.6) | 14 (10.9) | |
| 10,001–15,000 | 114 (29.5) | 85 (32.9) | 29 (22.5) | |
| 15,001–20,000 | 131 (33.9) | 89 (34.5) | 42 (32.6) | |
| > 20,000 | 88 (22.7) | 45 (17.4) | 43 (33.3) | |
| Education level, n (%) | 0.003 | |||
| Junior high school and lower | 10 (2.6) | 3 (1.2) | 7 (5.4) | |
| High school | 62 (16.0) | 32 (12.4) | 30 (23.3) | |
| University | 228 (58.9) | 160 (62.0) | 68 (52.7) | |
| Above university | 87 (22.5) | 63 (24.4 %) | 24 (18.6) | |
| Marriage duration (years), mean ± SD | 4.4 ± 4.1 | 3.2 ± 2.1 | 6.8 ± 5.8 | < 0.001 |
| Couple’s relationship, n (%) | 0.194 | |||
| Average | 40 (10.3) | 23 (8.9) | 17 (13.2) | |
| Good | 347 (89.7) | 235 (91.1) | 112 (86.8) | |
| ART semen collection, n (%) | 0.743 | |||
| No | 286 (73.9) | 192 (74.4) | 94 (72.9) | |
| Yes | 10 1(26.1) | 66 (25.6) | 35 (27.1) | |
| Cause of infertility, n (%) | < 0.001 | |||
| Male factors | 181 (46.8) | 128 (49.6) | 53 (41.1) | |
| Female factors | 47 (12.1) | 33 (12.8) | 14 (10.9) | |
| Both factors | 100 (25.8) | 49 (19.0) | 51 (39.5) | |
| Unknown | 59 (15.2) | 48 (18.6) | 11 (8.5) |
SD standard deviation, BMI body mass index, ART assisted reproduction technology