Table 5. Estimates of association from weighted logistic regression models to predict the risks of HbA1c ≥ 5.7% or ≥ 6.1% in Korean adults without diabetes after exclusion of subjects with HbA1c ≥6.5% (n = 10,026).

	For HbA1c ≥ 5.7%		For HbA1c ≥ 6.1%
	Odds ratio (95% CI)	p	Odds ratio (95% CI)	p
Age (10 year increase)	1.51 (1.44–1.58)	<0.001	1.62 (1.50–1.75)	<0.001
Men	0.88 (0.72–1.09)	0.242	0.66 (0.48–0.91)	0.011
Heavy alcohol drinking	0.49 (0.37–0.65)	<0.001	0.43 (0.27–0.68)	<0.001
Waist circumference (5cm increase)	1.14 (1.10–1.18)	<0.001	1.15 (1.09–1.22)	<0.001
College graduation	0.94 (0.82–1.09)	0.423	1.14 (0.87–1.50)	0.334
Smoking		<0.001		<0.001
Never smoking	reference		reference
Ex-smoking	0.97 (0.79–1.19)	0.766	0.93 (0.67–1.28)	0.644
Current smoking
<15 cigarettes/day	1.29 (1.04–1.61)	0.023	1.25 (0.82–1.90)	0.297
≥ 15 cigarettes /day	1.83 (1.39–2.41)	<0.001	2.53 (1.61–4.00)	<0.001
Hematocrit (2% increase)	0.94 (0.90–0.99)	0.014	0.94 (0.87–1.01)	0.082
Fasting plasma glucose (1mmol/l increase)	3.44 (3.04–3.89)	<0.001	6.82 (5.60–8.30)	<0.001

All odds ratios were from weighted analyses.