Table I.
Selected female and male characteristics by study outcome (n = 373).
| Pregnant, n (%), 247 (66) | Not pregnant, n (%), 51 (14) | Withdrew, n (%), 75 (20) | |
|---|---|---|---|
| Female age (years)a,b | 29.9 (3.9) | 30.2 (4.0) | 30.6 (4.7) |
| Male age (years)a,b | 31.7 (4.4) | 32.0 (5.2) | 32.3 (5.6) |
| Female race/ethnicity** | |||
| Non-Hispanic white | 204 (83.3) | 38 (74.5) | 52 (69.3) |
| Non-Hispanic black | 5 (2.0) | 3 (5.9) | 8 (10.7) |
| Hispanic | 20 (8.2) | 8 (15.7) | 10 (13.3) |
| Other | 16 (6.5) | 2 (3.9) | 5 (6.7) |
| Graviditya,**,b | 1.1 (1.3) | 0.8 (1.4) | 1.3 (1.6) |
| Nulligravid | 101 (41.2) | 33 (64.7) | 31 (41.3) |
| 1 | 71 (29.0) | 8 (15.7) | 18 (24.0) |
| 2+ | 73 (29.8) | 10 (19.6) | 26 (34.7) |
| Parity a,b** | 0.7 (0.8) | 0.2 (0.5) | 0.7 (0.9) |
| Nulliparous | 117 (48.0) | 44 (86.3) | 44 (58.7) |
| 1 | 89 (36.5) | 5 (9.8) | 16 (21.3) |
| 2+ | 38 (15.6) | 2 (3.9) | 15 (20.0) |
| Female BMIb | |||
| Underweight | 3 (1.2) | 1 (2.0) | 0 (0.0) |
| Healthy | 117 (47.4) | 22 (43.1) | 24 (32.0) |
| Overweight | 64 (25.9) | 11 (21.6) | 23 (30.7) |
| Obese | 63 (25.5) | 17 (33.3) | 28 (37.3) |
| Educational attainment**,b | |||
| High school or less | 13 (5.3) | 2 (3.9) | 7 (9.3) |
| Some college | 29 (11.9) | 11 (21.6) | 23 (30.7) |
| College graduate | 202 (82.8) | 38 (74.5) | 45 (60.0) |
| Income level**,b | |||
| <$29 999 | 6 (2.5) | 3 (5.9) | 7 (9.5) |
| $30 000–$49 999 | 20 (8.3) | 13 (25.5) | 11 (14.9) |
| $50 000–$69 999 | 36 (14.9) | 7 (13.7) | 14 (18.9) |
| At least $70 000 | 179 (74.3) | 28 (54.9) | 42 (56.8) |
| Average cigarettes per cycle**,c | 14.7 (66.9) | 55.7 (153.9) | 62.7 (188.9) |
| None | 201 (81.4) | 32 (62.7) | 52 (70.3) |
| 0 < Cigarettes < 11 | 22 (8.9) | 8 (15.7) | 7 (9.5) |
| 11 ≤ Cigarettes < 41 | 8 (3.2) | 2 (3.9) | 1 (1.4) |
| 41 ≤ Cigarettes | 16 (6.5) | 9 (17.6) | 14 (18.9) |
| Average alcoholic beverages per cyclec | 12.1 (15.1) | 12.1 (20.7) | 13.3 (18.2) |
| None | 30 (12.1) | 4 (7.8) | 8 (10.8) |
| 0 < Alcohol < 4 | 73 (29.6) | 16 (31.4) | 21 (28.4) |
| 4 ≤ Alcohol < 21 | 90 (36.4) | 26 (51.0) | 31 (41.9) |
| 21 ≤ Alcohol | 54 (21.9) | 5 (9.8) | 14 (18.9) |
| Average caffeinated beverages per cyclec | 37.4 (27.1) | 32.6 (26.1) | 41.8 (32.9) |
| None | 4 (1.6) | 1 (2.0) | 2 (2.7) |
| 0 < Caffeine < 14 | 42 (17.0) | 14 (27.5) | 15 (20.3) |
| 14 ≤ Caffeine < 41 | 102 (41.3) | 24 (47.1) | 24 (32.4) |
| 41 ≤ Caffeine | 99 (40.1) | 12 (23.5) | 33 (44.6) |
| Average acts of intercourse during the fertile window**,c | 2.8 (1.4) | 2.6 (1.6) | 2.6 (1.2) |
| None | 0 (0.0) | 0 (0.0) | 2 (3.1) |
| 0 < Intercourse < 4 | 191 (81.3) | 47 (94.0) | 54 (83.1) |
| 4 ≤ Intercourse | 44 (18.7) | 3 (6.0) | 9 (13.8) |
| Cortisol (μg/dl)*,c | 0.4 (0.6) | 0.3 (0.2) | 0.4 (0.3) |
| Alpha-amylase (U/ml)a,c | 22.7 (29.5) | 32.9 (34.1) | 25.4 (33.5) |
| Female average total of daily stress per cyclea,c | 54.8 (13.7) | 54.3 (15.6) | 56.5 (14.7) |
| Number of months trying prior to study entryb | |||
| 0 | 188 (76.1) | 32 (62.7) | 51 (68.0) |
| 1 | 24 (9.7) | 5 (9.8) | 9 (12.0) |
| 2 | 35 (14.2) | 14 (27.5) | 15 (20.0) |
| Form of contraception used at study entry | |||
| None | 158 (64.0) | 39 (76.5) | 54 (72.0) |
| Barrier method | 48 (19.4) | 7 (13.7) | 15 (20.0) |
| Hormonal method | 15 (6.1) | 1 (2.0) | 1 (1.3) |
| Natural method | 22 (8.9) | 4 (7.8) | 5 (6.7) |
| Intrauterine device | 3 (1.2) | 0 (0.0) | 0 (0.0) |
| Spermicide | 1 (0.4) | 0 (0.0) | 0 (0.0) |
Note: variable totals do not always equal the column totals due to missing values.
aMean (SD).
bAt baseline.
cDuring the study.
**P < 0.05.