4.

Univariate and multivariate analyses of precursor lesions associated factors

Characteristics	Univariate*				Multivariate
	OR	95% CI	P		OR	95% CI	P
Age (year)			0.002				0.002
41–50 vs. ≤40	2.10	(1.13, 4.45)			2.03	(1.09, 4.32)
51–60 vs. ≤40	2.73	(1.46, 5.85)			2.63	(1.39, 5.62)
>60 vs. ≤40	3.45	(1.53, 8.26)			3.73	(1.65, 8.96)
Gender			0.016				0.024
Female vs. male	0.73	(0.56, 0.95)			1.06	(0.72, 1.56)
Occupation			0.640
Peasant vs. worker	1.19	(0.42, 2.68)
Officer vs. worker	1.03	(0.72, 1.43)
Service vs. worker	0.95	(0.46, 1.72)
Retired vs. worker	1.28	(0.87, 1.84)
Others vs. worker	0.46	(0.08, 1.47)
Labor intensity			0.750
Moderate vs. light	1.03	(0.80, 1.31)
Heavy vs. light	0.89	(0.61, 1.26)