Table 1.
Baseline characteristics of participants
| Variables | Total (n = 2333) |
Non-Infertility (n = 2059) |
Infertility (n = 274) |
P |
|---|---|---|---|---|
| Age, years, mean (SD) | 31.37 (8.21) | 31.03 (8.28) | 33.91 (7.15) | < 0.001* |
| Age | < 0.001* | |||
| < 35 years | 1426 (61.12) | 1289 (62.60) | 137 (50.00) | |
| ≥ 35 years | 907 (38.88) | 770 (37.40) | 137 (50.00) | |
| Race | 0.033* | |||
| Non-Hispanic White | 748 (32.06) | 639 (31.03) | 109 (39.78) | |
| Non-Hispanic Black | 551 (23.62) | 492 (23.90) | 59 (21.53) | |
| Mexican-American | 378 (16.20) | 337 (16.37) | 41 (14.96) | |
| Other Race | 656 (28.12) | 591 (28.70) | 65 (23.72) | |
| Marital status | < 0.001* | |||
| Married/Cohabiting | 1228 (52.64) | 1024 (49.73) | 204 (74.45) | |
| Widowed/Divorced/Separated | 218 (9.34) | 190 (9.23) | 28 (10.22) | |
| Other | 887 (38.02) | 845 (41.04) | 42 (15.33) | |
| Education level | 0.128 | |||
| Below high school | 444 (19.03) | 396 (19.23) | 48 (17.52) | |
| High school | 482 (20.66) | 436 (21.18) | 46 (16.79) | |
| Above high school | 1407 (60.31) | 1227 (59.59) | 180 (65.69) | |
| Smoking status | 0.002* | |||
| Never | 1689 (72.40) | 1515 (73.58) | 174 (63.50) | |
| Former | 267 (11.44) | 223 (10.83) | 44 (16.06) | |
| Current | 377 (16.16) | 321 (15.59) | 56 (20.44) | |
| Drinking status | 0.021* | |||
| Never | 530 (22.72) | 483 (23.46) | 47 (17.15) | |
| Former | 79 (3.39) | 66 (3.21) | 13 (4.74) | |
| Mild | 580 (24.86) | 507 (24.62) | 73 (26.64) | |
| Moderate | 568 (24.35) | 510 (24.77) | 58 (21.17) | |
| Heavy | 576 (24.69) | 493 (23.94) | 83 (30.29) | |
| Hypertension | < 0.001* | |||
| No | 1967 (84.31) | 1764 (85.67) | 203 (74.09) | |
| Yes | 366 (15.69) | 295 (14.33) | 71 (25.91) | |
| Diabetes | 0.201 | |||
| No | 1929 (82.68) | 1705 (82.81) | 224 (81.75) | |
| IGT | 215 (9.22) | 194 (9.42) | 21 (7.66) | |
| Yes | 189 (8.10) | 160 (7.77) | 29 (10.58) | |
| Log CMI, mean (SD) | –0.96 (0.27) | –0.97 (0.27) | –0.90 (0.26) | < 0.001* |
| Log CMI | < 0.001* | |||
| Q1 | 586 (25.12) | 546 (26.52) | 40 (14.60) | |
| Q2 | 584 (25.03) | 513 (24.92) | 71 (25.91) | |
| Q3 | 580 (24.86) | 499 (24.24) | 81 (29.56) | |
| Q4 | 583 (24.99) | 501 (24.33) | 82 (29.93) |
Data are shown as number (%) unless otherwise indicated
*Statistically significant (P < 0.05)
Log CMI quartile range: Q1, − 1.799, − 1.153; Q2, − 1.154, − 0.984; Q3, − 0.985, − 0.785; Q4, − 0.786, 0.318
SD, standard deviation; IGT, impaired glucose tolerance; CMI, cardiometabolic index; Q, quartile