| Value | Category |
|---|---|
| 100 | day of interview |
| 101 | days: 1 |
| 199 | days: number missing |
| 201 | weeks: 1 |
| 299 | weeks: number missing |
| 301 | months: 1 |
| 399 | months: number missing |
| 401 | years: 1 |
| 499 | years: number missing |
| 994 | in menopause/had hysterectomy |
| 995 | before last birth |
| 996 | never menstruated |
| 997 | inconsistent |
| 998 | don't know |
| Sysmiss |