Blood lead is significantly associated with metabolic syndrome in Korean adults: an analysis based on the Korea National Health and Nutrition Examination Survey (KNHANES), 2008

Table 2 Adjusted ORs of the study subjects with metabolic syndrome according to logarithmic transformed lead quartiles

	Model 1*	p	Model 2**	p
	OR (95% CI)		OR (95% CI)
Quartile 1	Referent	-	Referent	-
Quartile 2	1.54 (0.93-2.56)	0.095	1.56 (0.90-2.71)	0.117
Quartile 3	1.82 (1.10-3.01)	0.020	1.63 (0.94-2.83)	0.081
Quartile 4	2.50 (1.50-4.15)	<0.001	2.57 (1.46-4.51)	0.001
p for trend***		0.001		0.001

OR, odds ratio; CI, confidence interval.
* Model 1 is shown as OR and 95% CI adjusted for age, sex, smoking, and education.
** Model 2 is shown as OR and 95% CI further adjusted for total cholesterol, creatinine, aspartate amino transferase, alanine aminotransferase, and fasting serum insulin.
*** Linear trend obtained from the significance of the continuous version of these quartiles entered into the same model.

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