TABLE 1.
Characteristics of the Study Sample by Current BMI Category
| BMI <25 kg/m2 (n = 44) Mean (SD) |
25 ≤ BMI < 30 kg/m2 (n = 78) Mean (SD) |
BMI ≥30 kg/m2 (n = 67) Mean (SD) |
P | Total (n = 193a) Mean (SD) |
|
|---|---|---|---|---|---|
| Participant at follow-up | |||||
| Sperm concentration (×106/mL) | 68 (54) | 76 (68) | 74 (53) | 0.78 | 74 (59) |
| % progressive motility | 40 (16) | 42 (16) | 38 (16) | 0.26 | 40 (16) |
| % normal morphology | 6.9 (3.7) | 7.7 (4.1) | 8.0 (4.7) | 0.40 | 7.6 (4.2) |
| Age (years) | 44 (1.6) | 44 (1.8) | 44 (1.6) | 0.94 | 44 (1.7) |
| Alcohol (g/wk) | 88 (121.4) | 100 (160) | 56 (96) | 0.12 | 82 (130) |
| Perceived stress scale | 12 (5.6) | 12 (5.9) | 14 (6.2) | 0.11 | 12 (5.9) |
| Exercise (mins/wk) | 520 (870) | 530 (730) | 570 (780) | 0.93 | 540 (780) |
| Abstinence time (hr) | 97 (43) | 100 (98) | 113 (100) | 0.55 | 103 (88) |
| n (%) | n (%) | n (%) | P | n (%) | |
| Participant at follow-up | |||||
| Race | 0.76 | ||||
| White | 27 (61) | 43 (55) | 36 (54) | 110 (570) | |
| Black | 10 (23) | 17 (22) | 19 (28) | 46 (24) | |
| Other | 7 (16) | 18 (23) | 12 (18) | 37 (19) | |
| Income (×US$1,000) | 0.56 | ||||
| ≤50 | 12 (27) | 21 (28) | 21 (35) | 55 (31) | |
| 50–99 | 15 (34) | 26 (35) | 23 (38) | 64 (36) | |
| 100–149 | 6 (14) | 16 (21) | 9 (15) | 31 (17) | |
| ≥150 | 11 (25) | 12 (16) | 7 (12) | 30 (17) | |
| Smoking | 1.0 | ||||
| Current | 8 (18) | 14 (18) | 11 (18) | 33 (18) | |
| Never/ever | 36 (82) | 64 (82) | 51 (82) | 152 (82) | |
| Hormone use | 0.42 | ||||
| Yes | 0 (0) | 1 (1.3) | 2 (3.3) | 3 (1.7) | |
| No | 42 (100) | 75 (99) | 59 (97) | 180 (98) | |
| Employment | 0.69 | ||||
| Employed | 37 (84) | 69 (89) | 52 (84) | 159 (86) | |
| Unemployed | 7 (16) | 9 (12) | 10 (16) | 26 (14) | |
| Mean (SD) | Mean (SD) | Mean (SD) | P | Mean (SD) | |
| Participant at birth | |||||
| Birthweight (g) | 3,258 (540) | 3,456 (442) | 3,407 (620) | 0.14 | 3,389 (536) |
| Gestational age (days) | 280 (17) | 277 (18) | 279 (17) | 0.60 | 279 (17) |
| Birthweight percentile | 37 (28) | 51 (25) | 45 (29) | 0.03 | 45 (29) |
| Mean (SD) | Mean (SD) | Mean (SD) | P | Mean (SD) | |
| Parental | |||||
| Maternal age (years) | 29 (26) | 28 (5.7) | 29 (6.1) | 0.74 | 28 (5.9) |
| Maternal BMI (kg/m2, n = 148) | 22 (3.0) | 22 (2.3) | 23 (3.7) | 0.02 | 22 (3.1) |
| Paternal BMI (kg/m2, n = 128) | 24 (3.6) | 24 (3.5) | 25 (2.7) | 0.36 | 24 (3.2) |
| n (%) | n (%) | n (%) | P | n (%) | |
| Parental | |||||
| Maternal parity | 0.32 | ||||
| Nulliparous | 4 (9.1) | 14 (18) | 13 (19) | 33 (17) | |
| Parous | 40 (91) | 64 (82) | 54 (81) | 160 (83) | |
| Maternal prenatal smoking | 0.34 | ||||
| Yes | 13 (30) | 20 (26) | 12 (18) | 46 (24) | |
| No | 31 (70) | 56 (74) | 54 (82) | 143 (76) | |
a
Includes 4 participants who were missing BMI data.