Table 1.

Characteristics of the Cases and Noncases Among Woman Textile Workers in Shanghai, China, 1989–2000

Characteristic	Cases (n = 1,709)		Noncases (n = 4,780)
	No.	%	No.	%
Birth year
1925–1929	266	15.56	1,076	22.51
1930–1934	371	21.71	1,146	23.97
1935–1939	173	10.12	514	10.75
1940–1944	113	6.61	249	5.21
1945–1949	252	14.75	448	9.37
1950–1954	335	19.60	624	13.05
1955–1958	199	11.64	723	15.13
Duration of follow up, yearsa	5.19 (2.92)		10.9 (1.35)
Years of employment in STIB
≤20	524	30.66	1,354	27.91
21–30	766	44.82	2,183	45.67
31–40	414	24.22	1,236	25.86
>40	5	0.29	27	0.56
No. of jobs held
1	761	44.53	2,536	53.05
2	635	37.16	1,555	32.53
3	224	13.11	474	9.92
≥4	89	5.21	215	4.50

Abbreviation: STIB, Shanghai Textile Industry Bureau.

^a Values are presented as mean (standard deviation).