Table 1.
Demographic characteristics in melamine tableware manufacturing workers by worksites and their comparison group
| Variables | Exposed Workers (n=44) | Nonexposed workers Controls (N=105) | P valuea (Overall) | P valueb(Manufacturers versus Controls) | |||
|---|---|---|---|---|---|---|---|
| Manufacturers (N=16) | Grinders (N=8) | Packers (N=10) | Administrators (N=10) | ||||
| N (%) | |||||||
| Factory | |||||||
| A | 7 | 4 | 4 | 8 | — | ||
| B | 9 | 4 | 6 | 2 | |||
| Gender | |||||||
| Male | 12 (75.0) | 3 (37.0) | 2 (20.0) | 4 (40.0) | 97 (92.0) | <0.001 | 0.053 |
| Female | 4 (25.0) | 5 (62.0) | 8 (80.0) | 6 (60.0) | 8 (8.0) | ||
| Education (year) | |||||||
| ≤9 | 12 (75.0) | 5 (63.0) | 6 (60.0) | 2 (20.0) | 2 (2.0) | <0.001 | <0.001 |
| >9 | 4 (25.0) | 3 (38.0) | 4 (40.0) | 8 (80.0) | 103 (98.0) | ||
| Personal habits | |||||||
| Current smokers | 4 (25.0) | 2 (25.0) | 1 (10.0) | 2 (20.0) | 13 (12.4) | 0.580 | 0.164 |
| Current betel chewers | 2 (12.5) | 0 | 0 | 0 | 6 (5.7) | 0.523 | 0.285 |
| Current drinkers | 4 (25.0) | 1 (12.5) | 1 (10.0) | 3 (30.0) | 50 (47.6) | 0.029 | 0.075 |
| Mean±SD (median, IQR) | |||||||
| Age (years) | 47.3±6.2 | 43.9±8.43 | 38.4±9.9 | 36.5±8.5 | 48.8±9.0 | <0.001 | 0.119 |
| (49.0, 40.8–52.5) | (48.0, 34.0–50.8) | (38.5, 29.8–48.5) | (34.0, 30.3–42.0) | (51.0, 48.0–55.0) | |||
| Year of employment (years) | 18.0±11.7 | 6.9±9.0 | 7.1±6.1 | 8.9±5.3 | — | 0.014 | — |
| (18.0, 7.0–26.0) | (2.5, 1.0–10.0) | (5.5, 1.8–14.3) | (10.0, 3.5–12.3) | — | |||
| BMI | 23.1±4.5 | 22.6±3.4 | 22.5±2.5 | 25.4±7.1 | 23.7±2.7 | 0.482 | 0.603 |
| (23.7, 20.0–25.4) | (21.7, 19.7–4.9) | (22.3, 20.8–23.9) | (22.6, 20.8–29.4) | (23.2, 22.0–25.5) | |||
| WHR | 0.9±0.1 | 0.8±0.1 | 0.8±0.0 | 0.9±0.1 | 1.6±7.2 | 0.058 | 1.000 |
| (0.9, 0.8–0.9) | (0.8, 0.8–0.9) | (0.8, 0.8–0.9) | (0.8, 0.8–0.9) | (0.9, 0.8–0.9) | |||
IQR, interquartile range; BMI, body mass index; WHR, waist-to-hip ratio.
a
Kruskal–Wallis test or chi-squared test.
b
Wilcoxon rank-sum test or Fisher’s exact test.