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Table 1 Characteristics of the 101,823 subjects in the Guangzhou Occupational Cohorts, at baseline (1992)

From: Smoking and nasopharyngeal carcinoma mortality: a cohort study of 101,823 adults in Guangzhou, China

  Men Women Total
  N = 86,269 (%) N = 15,554 (%) N = 101,823 (%)
Age, years
 30–34 4568 (5.5) 993 (6.4) 5561 (5.5)
 35–39 41,645 (48.3) 8452 (54.3) 50,097 (49.2)
 40–44 21,769 (25.2) 4107 (26.4) 25,876 (25.4)
 45–49 9663 (25.2) 1488 (9.6) 11,151 (11.0)
 50–54 5033 (5.8) 392 (2.5) 5425 (5.3)
 55–59 3077 (3.6) 80 (0.5) 3157 (3.1)
 60+ 514 (0.6) 42 (0.3) 556 (0.6)
Marital status
 Married 85,247 (98.8) 15,143 (97.4) 100,390 (98.6)
 Not married 510 (0.6) 345 (2.2) 855 (0.8)
 Missing 512 (0.6) 66 (0.4) 578 (0.6)
Education level
 Primary or below 7440 (8.6) 3152 (20.3) 10,592 (10.4)
 Secondary 67,405 (78.1) 11,073 (71.2) 78,478 (77.1)
 Tertiary 10,894 (12.6) 1222 (7.9) 12,116 (11.9)
 Missing 530 (0.6) 107 (0.7) 637 (0.6)
Rank
 Cadre 19,535 (22.6) 3326 (21.4) 22,861 (22.5)
 Worker 65,458 (75.9) 12,090 (77.7) 77,548 (76.2)
 Missing 1276 (1.5) 138 (0.9) 1402 (1.4)
Health status
 Healthy 71,337 (82.7) 11,666 (75.0) 83,003 (81.5)
 Fairly Healthy 9018 (10.5) 2642 (17.0) 11,660 (11.5)
 Abnormal 1332 (1.5) 74 (0.5) 1406 (1.4)
 Unknown 4346 (5.0) 1061 (6.8) 5407 (5.3)
 Missing 236 (0.3) 111 (0.7) 347 (0.3)
Smoking status
 Never smokers 40,119 (46.5) 15,464 (99.4) 55,583 (54.6)
 Occasional smokers 114 (0.1) 1 (0.01) 115 (0.1)
 Daily smokers 45,988 (53.3) 89 (0.6) 46,077 (45.3)
 Ex-smokers 13 (0.02) 0 13 (0.01)
 Missing 35 (0.04) 0 35 (0.03)
Drinking status
 Never drinkers 71,340 (82.7) 15,164 (97.5) 86,504 (85.0)
 Occasional smokers 6273 (7.3) 341 (2.2) 6614 (6.5)
 Daily drinkers 8432 (9.8) 43 (0.3) 8475 (8.3)
 Ex-drinkers 27 (0.03) 0 27 (0.03)
 Missing 197 (0.2) 6 (0.04) 203 (0.2)