TABLE 2.
Participant characteristics by BMI.
| Characteristic | BMI <30 kg/m2 (n = 438) | BMI ≥30 kg/m2 (n = 194) | P value |
|---|---|---|---|
| Age (y) | 33.94 ± 4.56 | 33.76 ± 4.81 | .656 |
| Caucasian | 396 (91%) | 170 (89%) | .518 |
| History of smoking | 67 (15%)a | 50 (26%) | .003 |
| Current smoker | 8 (2%)b | 7 (4%) | .254c |
| Gravidity | 1 (0–2) | 1 (1–2) | .764 |
| Parity | 1 (0–1) | 1 (0–1) | .044 |
| Previous cycles | 1 (1–1) | 1 (1–1) | .527 |
| Diagnosisd | |||
| Advanced maternal age | 31 (7%) | 8 (4%) | .220 |
| Anovulation | 81 (19%) | 55 (29%) | .006 |
| Diminished ovarian reserve | 39 (9%) | 25 (13%) | .157 |
| Endometriosis | 47 (11%) | 18 (9%) | .698 |
| Male factor | 151 (35%) | 73 (38%) | .464 |
| Tubal factor | 68 (16%) | 35 (18%) | .479 |
| Uterine factor | 20 (5%) | 17 (9%) | .056 |
| Unexplained | 99 (23%) | 29 (15%) | .039 |
| Other | 59 (14%) | 26 (14%) | 1.000 |
| No. of embryos Transferred | 1 (1–1) | 1 (1–1) | .557 |
| Use of preimplantation genetic testing | 54 (12%) | 26 (13%) | .807 |
Note: Data are presented as mean ± standard deviation with P values for Student’s t test, number (%) with P values for chi-square test, or median (interquartile range) with P values for Mann-Whitney U test. BMI = body mass index.
a
Missing data for 1 case.
b
Missing data for 16 cases.
c
P value for Fisher’s exact test as the expected counts for chi-square test were not met.
d
Two hundred participants in the dataset had multiple diagnoses; so sum across diagnoses categories will not total 100%. Moreover, 42 cases did not have any diagnosis specified.