Table 1 Demographic characteristics of subjects analyzed in the study.
Subjects | Number | Gender, n (%) | Age, years | |||
|---|---|---|---|---|---|---|
Female | Male | Mean (SD) | ≤50, n (%) | >50, n (%) | ||
Shanghai cohorta | ||||||
Cases | 440 | 109 (24.77) | 331 (75.23) | 49.53 (10.94) | 249 (56.59) | 191 (43.41) |
Controls | 1265 | 464 (36.68) | 801 (63.32) | 51.00 (12.89) | 536 (42.47) | 729 (57.63) |
Beijing cohortb | ||||||
Cases | 272 | 65 (23.90) | 207 (76.10) | 48.19 (12.30) | 160 (58.82) | 112 (41.18) |
Controls | 1336 | 491 (36.75) | 845 (63.25) | 42.73 (15.04) | 947 (70.88) | 389 (29.12) |