1. Baseline demographic and clinical characteristics of the study population [n (%)] .
| Characteristic | Women (n=14 311) |
|
*Multiple diagnoses were possible, so totals are greater than 100%; PCOS: polycystic ovarian syndrome; IVF: in vitro fertilization; ICSI: intracytoplasmic sperm injection.
| |
| Age (year) | |
| Mean±SD | 30.95±4.65 |
| ≤30 | 6990 (48.84) |
| 30–34 | 4245 (29.66) |
| 34–37 | 1816 (12.69) |
| >37 | 1260 (8.80) |
| BMI (kg/m2) | |
| Mean±SD | 22.7±3.31 |
| <18.5 | 963 (6.73) |
| 18.5–24 | 8753 (61.16) |
| 24–28 | 3238 (22.63) |
| ≥28 | 996 (6.96) |
| Missing | 361 (2.52) |
| Duration of infertility (year) | |
| Mean±SD | 4.04±3.13 |
| <2 | 2693 (18.82) |
| 2–3 | 2684 (18.75) |
| 3–5 | 3911 (27.33) |
| ≥5 | 4447 (31.07) |
| Missing | 576 (4.02) |
| Type of infertility | |
| Primary infertility | 8387 (58.61) |
| Secondary infertility | 5761 (40.26) |
| Missing | 163 (1.14) |
| Infertility diagnosis* | |
| Male factor | 3169 (22.14) |
| Endometriosis | 1118 (7.81) |
| Ovulation disorder or PCOS | 1559 (10.89) |
| Tubal factor | 8941 (62.48) |
| Unexplained factor | 475 (3.32) |
| Insemination method | |
| IVF | 10 325 (72.15) |
| ICSI | 3063 (21.40) |
| IVF+ICSI | 602 (4.21) |
| Missing | 321 (2.24) |
| Endometrial thickness (mm) | |
| Mean±SD | 10.39±2.36 |
| <7 | 415 (2.90) |
| ≥7 | 10 602 (74.08) |
| Missing | 3294 (23.02) |