Table 1.
Description of the study population.
| Characteristics | Values, n (%) | |
| Age (years; n=1,579,819) | ||
|
|
18-24 | 638,683 (40.43) |
|
|
25-29 | 383,179 (24.25) |
|
|
30-34 | 275,039 (17.41) |
|
|
35-39 | 162,156 (10.26) |
|
|
40-55 | 120,762 (7.64) |
| BMI (kg/m2; n=356,598) | ||
|
|
≤18.4 | 33,195 (9.31) |
|
|
18.5-24.9 | 202,420 (56.76) |
|
|
25.0-29.9 | 70,707 (19.83) |
|
|
30.0-34.9 | 30,144 (8.45) |
|
|
35.0-50.0 | 19,540 (5.48) |
|
|
≥50+ | 592 (0.17) |
| Menstruation flow (n=197,579) | ||
|
|
Light | 44,171 (22.36) |
|
|
Medium | 148,236 (75.03) |
|
|
Heavy | 5172 (2.62) |
| Smoking status (n=746,369) | ||
|
|
Regularly | 104,612 (14.01) |
|
|
Sometimes | 87,506 (11.72) |
|
|
Do not smoke | 554,278 (74.26) |
| How often do you drink alcohol? (n=742,615) | ||
|
|
≥3 times a week | 42,115 (5.67) |
|
|
1-2 times a week | 144,263 (19.42) |
|
|
<2-3 times a month | 310,597 (41.82) |
|
|
None | 245,640 (33.08) |
| Frequency of high stress (n=768,571) | ||
|
|
≥3 times a week | 252,894 (32.90) |
|
|
1-2 times a week | 248,630 (32.35) |
|
|
<3 times a month | 218,490 (28.43) |
|
|
None | 48,557 (6.32) |
| Frequency of physical activity (n=800,870) | ||
|
|
≥3 times a week | 140,287 (17.52) |
|
|
1-2 times a week | 176,124 (22.00) |
|
|
<3 times a month | 121,145 (15.13) |
|
|
None | 363,314 (45.36) |
| Relationship status (n=748,612) | ||
|
|
Married or stable partner | 531,360 (70.98) |
|
|
Single | 73,194 (9.78) |
|
|
No partner | 144,058 (19.24) |
| Trying to conceive (n=137,973) | ||
|
|
<1 month | 36,510 (26.46) |
|
|
1-3 months | 27,383 (19.85) |
|
|
3-6 months | 17,108 (12.40) |
|
|
>6 months to 1 year | 15,088 (10.94) |
|
|
>1 year | 41,884 (30.36) |
| Number of children (n=709,037) | ||
|
|
0 | 501,976 (70.80) |
|
|
1 or 2 | 178,303 (25.15) |
|
|
≥3 | 28,758 (4.06) |
| Any reproductive disorders (n=687,290) | ||
|
|
Yes | 76,722 (11.16) |
|
|
No | 443,597 (64.54) |
|
|
I don’t know | 166,971 (24.29) |