Table 1.
Characteristics of Study Cohort by Baseline Level of Urinary FSH (Low, Middle, and High; N = 209).a
| Low (N = 59), <7 mIU/mg cr | Middle (N = 108), 7-11.9 mIU/mg cr | High (N = 42), ≥12 mIU/mg cr | P Valueb | |
|---|---|---|---|---|
| Age, years | .002 | |||
| 30-34 | 45 (76) | 78 (72) | 21 (50) | |
| 35-37 | 9 (15) | 19 (18) | 9 (21) | |
| 38-44 | 5 (9) | 11 (10) | 12 (29) | |
| Body mass index, kg/m2 | .50 | |||
| <18.5 | 2 (3) | 3 (3) | 1 (2) | |
| 18.5-24 | 37 (64) | 70 (65) | 24 (58) | |
| 25-29 | 11 (19) | 24 (22) | 8 (20) | |
| ≥30 | 8 (14) | 11 (10) | 8 (20) | |
| History of gonorrhea or chlamydia | 4 (7) | 3 (3) | 1 (2) | .38 |
| Current smoker | 1 (2) | 2 (2) | 1 (2) | .97 |
| Hormonal contraceptivec use in past year | 33 (57) | 42 (39) | 21 (50) | .07 |
| Menstrual cycle day of urine collection | 3 (2-4) | 3 (2-4) | 3 (2-4) | .80 |
| Questionnaire: regular menstrual cycles | 57 (97) | 89 (83) | 37 (88) | .04 |
| Diaryd: intercycle menstrual length variancee | 7.0 (2.3-21.3) | 4.5 (1.3-10.3) | 4.3 (1.3-13.0) | .24 |
| Menstrual cycle length, days | ||||
| Questionnaire | 28.0 (28.0-30.0) | 28.5 (28.0-30.0) | 28.0 (27.0-29.5) | .29 |
| Diary datad | 29.4 (27.0-32.6) | 28.5 (27.0-31.4) | 28.2 (26.3-31.5) | .36 |
Abbreviations: cr, creatinine; FSH, follicle-stimulating hormone.
a Data presented as number (%) or median (interquartile range).
b For categorical variables, the Cochran-Mantel-Haenszel tests for association were used. For the continuous variables, the nonparametric Kruskal-Wallis test was employed. P values were not adjusted for other variables in the table.
c Oral contraceptive pills, contraceptive patch, or contraceptive vaginal ring.
d For women that have diary data (n = 174).
e For women with diary data for more than 1 cycle (N = 131).