Table 1.
Patient demographics and cycle characteristics.
| Patient demographics and cycle characteristics | Lesbian | Heterosexual | |
|---|---|---|---|
| Patient demographics | n = 109 | n = 3,725 | ASDa |
| Age at first IUI (y)b | 36.79 (3.7) | 36.76 (4.1) | 0.01 |
| Cycle characteristics | n = 393 | n = 11,477 | |
| Total motile count (× 106)b | 18.4 (10.1) | 83.0 (94.1) | 0.97 |
| Missing TMC, n (%) | 44 (11.2) | 1,354 (11.8) | 0.02 |
| Cycle type, n (%) | 0.73 | ||
| Clomiphene citrate | 126 (32.1) | 6,401 (55.8) | |
| FSH/LH | 2 (0.5) | 40 (0.3) | |
| Letrozole | 76 (19.3) | 3,171 (27.6) | |
| Natural cycle | 187 (47.6) | 1,825 (15.9) | |
| Unknown | 2 (0.5) | 40 (0.3) | |
| Semen source, n (%) | 8.00 | ||
| Donor | 393 (100.0) | 349 (3.0) | |
| Partner | 0 (0.0) | 11,128 (97.0)) |
Note: ASD = absolute standardized difference; FSH = follicle-stimulating hormone; IUI = intrauterine insemination; LH = luteinizing hormone; TMC = total motile count.
a
ASD calculated between the heterosexual and lesbian groups; this represents the difference in means or proportions between the two groups divided by the pooled standard deviation; 0.2, 0.5, and 0.8 correspond to small, medium, and large differences, respectively. Therefore, smaller standardized differences represent less difference between the two groups.
b
Means and standard deviations reported for continuous variables.