Table 1.
Quantitative variables with U value of the Mann-Whitney U test
| Cases | Controls | U value | |
|---|---|---|---|
| Age, years (n = 312) | 62.6 (38–85) | 62.4 (36–86) | ns |
| Age of menarche, years (n = 311) | 12.6 (9–16) | 12.7 (9–16) | ns |
| Age of menopause, years (n = 289) | 47.7 (33–58) | 49.7 (30–58) | 0.01 |
| Estimated fertile life, yearsa (n = 289) | 34.8 (21–49) | 36.5 (15–46) | 0.004 |
| Number of pregnancies (n = 312) | 2.5 (0–8) | 2.3 (0–7) | ns |
| Age of first pregnancy (n = 289) | 27.5 (18–43) | 27.0 (17–42) | ns |
| Number of abortions (n = 312) | 0.4 (0–4) | 0.3 (0–4) | ns |
| Number of live births (n = 312) | 2.1 (0–5) | 2.0 (0–6) | ns |
| Total months of breastfeedingb (n = 293) | 8.5 (0–51) | 7.0 (0–43) | ns |
Values are means with ranges in parentheses. ns, not significant.
a
Fertile life: calculated as age of menopause – age of menarche for postmenopausal women, and as age – age of menarche for premenopausal women.
b
Breastfeeding was recorded in the questionnaire as months of breastfeeding for each child and total time of breastfeeding in months.