Table 1.
Characteristics of participants in the 24-hour urine collection study by cohort and case status.
| Variable | NHS I Case (N=947) | NHS I Control (N=407) | NHS II Case (N=833) | NHS II Control (N=443) | HPFS Case (N=728) | HPFS Control (N=417) |
|---|---|---|---|---|---|---|
| Age | 66.5 (7.8)b | 65.5 (5.7) | 48.4 (6.2)a | 51.0 (5.1) | 63.4 (8.8)a | 64.6 (6.3) |
| Weight, kg | 73.4 (15.6)a | 69.7 (14.5) | 74.8 (18.3)b | 72.3 (17.1) | 83.5 (12.3) | 84.0 (13.2) |
| Body mass index (kg/m) | 27.4 (5.7)a | 25.8 (5.1) | 27.8 (6.6)a | 26.6 (6.0) | 26.2 (3.6) | 26.2 (3.6) |
| Family history (%) | NA | NA | 31.5%a | 14.5% | 20.6%a | 13.0% |
HPFS, Health Professionals Follow-up Study; NHS I, Nurses’ Health Study Cohort; NHS II, Nurses’ Health Study II; NA, not available
Values are means (SD) except where otherwise noted
a
p≤0.01 for case compared with control within the cohort
b
p<0.05 for case compared with control within the cohort