Table 1.
Characteristics for Women and Men: LIFE Study, 2005 to 2009.a
| Characteristics | Women | Men |
|---|---|---|
| Age, mean (±SD), years | 30.0 (4.1) | 31.8 (4.9) |
| Race/ethnicity, n (%) | ||
| Non-Hispanic white | 407 (81.2) | 412 (82.2) |
| Hispanic | 50 (10.0) | 48 (9.6) |
| Non-Hispanic blacks | 23 (4.6) | 25 (5.0) |
| Otherb | 17 (3.4) | 14 (2.8) |
| Missing | 4 (0.8) | 2 (0.4) |
| Education, n (%) | ||
| Less than college | 121 (24.2) | 187 (37.3) |
| College or greater | 379 (75.6) | 311 (62.1) |
| Missing | 1 (0.2) | 3 (0.6) |
| Health insurance, n (%) | ||
| No | 40 (8.0) | 43 (8.6) |
| Yes | 461 (92.0) | 458 (91.4) |
| BMI, n (%) | ||
| Underweight (≤18.5) | 12 (2.4) | 17 (3.4) |
| Normal weight (18.5-24.9) | 218 (43.5) | 78 (15.6) |
| Overweight (25.0-29.9) | 136 (27.1) | 203 (40.5) |
| Obese (≥30.0) | 130 (25.9) | 196 (39.1) |
| Missing | 5 (1.0) | 7 (1.4) |
| Smoking in the past 12 months, n (%) | ||
| No | 419 (83.6) | 382 (76.2) |
| Yes | 82 (16.4) | 119 (23.8) |
| Number of alcoholic beverages on a typical occasion in the past 12 months, n (%) | ||
| None | 127 (25.3) | 73 (14.6) |
| 1 drink | 108 (21.6) | 63 (12.6) |
| 2 to 3 drinks | 237 (47.3) | 249 (49.7) |
| 4 to 5 drinks or more | 28 (5.6) | 116 (23.2) |
| Missing | 1 (0.2) | – |
| Participation in a regular vigorous exercise program in the past 12 months, n (%) | ||
| No | 301 (60.1) | 290 (57.9) |
| Yes | 200 (39.9) | 211 (42.1) |
| High blood pressure, n (%) | ||
| No | 481 (96.0) | 448 (89.4) |
| Yes | 20 (4.0) | 52 (10.4) |
| Missing | 0 (0.0) | 1 (0.2) |
| High cholesterol, n (%) | ||
| No | 460 (91.8) | 422 (84.2) |
| Yes | 41 (8.2) | 78 (15.6) |
| Missing | 0 (0.0) | 1 (0.2) |
| Diabetes, n (%) | ||
| No | 494 (98.6) | 486 (97.0) |
| Yes | 6 (1.2) | 14 (2.8) |
| Missing | 1 (0.2) | 1 (0.2) |
| Hypothyroid disease, n (%) | ||
| No | 462 (92.2) | 497 (99.2) |
| Yes | 39 (7.8) | 4 (0.8) |
| Mood disorder, n (%) | ||
| No | 460 (91.8) | 487 (97.2) |
| Yes | 40 (8.0) | 12 (2.4) |
| Missing | 1 (0.2) | 2 (0.4) |
| Anxiety disorder, n (%) | ||
| No | 463 (92.4) | 480 (95.8) |
| Yes | 38 (7.6) | 21 (4.2) |
| Gravidity, n (%) | ||
| 0 | 210 (41.9) | 215 (42.9) |
| 1 to 2 | 221 (44.1) | 226 (45.1) |
| ≥3 | 68 (13.6) | 58 (11.6) |
| Missing | 2 (0.4) | 2 (0.4) |
| Couples’ time to pregnancy,c n (%) | ||
| No recognized pregnancy within the study period or withdrew | 154 (30.7) | – |
| 0 to <3 cycles | 213 (42.5) | – |
| ≥3 to <6 cycles | 89 (17.8) | – |
| ≥6 to <9 cycles | 30 (6.0) | – |
| ≥9 to <12 cycles | 15 (3.0) | – |
Abbreviations: BMI, body mass index; LIFE, Longitudinal Study of Infertility and the Environment; SD, standard deviation.
aN = 501.
bIncludes Non-Hispanic Asian, Non-Hispanic American Indian, and Non-Hispanic other.
cMenstrual cycles until pregnancy.