Table 1.
Characteristics of the cases and non-cases among woman textile workers in Shanghai, China
| Case (n=1709) | Non-case (n=4780) | |||
|---|---|---|---|---|
| n | % | n | % | |
| Birth year | ||||
| 1925-1929 | 266 | (15.56) | 1090 | (22.57) |
| 1930-1934 | 371 | (21.71) | 1158 | (23.98) |
| 1935-1939 | 173 | (10.12) | 523 | (10.83) |
| 1940-1944 | 113 | (6.61) | 251 | (5.20) |
| 1945-1949 | 252 | (14.75) | 453 | (9.38) |
| 1950-1954 | 335 | (19.60) | 625 | (12.94) |
| 1955-1958 | 199 | (11.64) | 730 | (15.11) |
| Age at beginning of follow-up (yrs) | ||||
| 30 - 40 | 568 | (33.24) | 1396 | (29.21) |
| >40 - 50 | 341 | (19.95) | 664 | (13.89) |
| >50 - 60 | 556 | (32.53) | 1721 | (36.00) |
| >60 - 66 | 244 | (14.28) | 999 | (20.90) |
| Duration of follow up (yrs) | ||||
| mean (SD) | 5.19 | (2.92) | 10.9 | (1.35) |
| Work history | ||||
| Years of employment in STIB | ||||
| <=20 | 524 | (30.66) | 1354 | (27.91) |
| >20 - 30 | 766 | (44.82) | 2183 | (45.67) |
| >30 - 40 | 414 | (24.22) | 1236 | (25.86) |
| > 40 | 5 | (0.29) | 27 | (0.56) |
| Average number of jobs held | ||||
| 1 | 761 | (44.53) | 2536 | (53.05) |
| 2 | 635 | (37.16) | 1555 | (32.53) |
| 3 | 224 | (13.11) | 474 | (9.92) |
| 4+ | 67 | (5.20) | 33 | (4.50) |
| Shiftwork | ||||
| No | 968 | (56.64) | 2341 | (48.97) |
| Yes | 741 | (43.36) | 2439 | (51.03) |
| Years doing shiftwork | ||||
| 1 -- <= 10 | 21 | (2.83) | 62 | (2.54) |
| 10--<=15 | 57 | (7.69) | 158 | (6.48) |
| 15--<=20 | 135 | (18.22) | 404 | (16.56) |
| More than 20 | 528 | (71.26) | 1815 | (74.42) |