Metabolic syndrome and the early detection of impaired glucose tolerance among professionals living in Beijing, China: a cross sectional study

Table 4 The combined effect of waist circumference level and fasting glucose level on the risk of IGT ^a

Waist circumference level	FPG <5.6 mmol/l (n = 657)		FPG: 5.6-6.0 mmol/l (n = 183)		FPG ≥6.1 mmol/l (n = 88)
Waist circumference level	n1	Prevalence of IGT (%)	n2	Prevalence of IGT (%)	n3	Prevalence of IGT (%)
1	350	34 (9.7)	66	20 (31.3)	23	12 (43.5)
2	218	52 (23.9)	77	26 (33.8)	33	19 (57.6)
3	89	23 (25.8)	40	19 (47.5)	32	22 (59.4)

^aTrend P < 0.0001. IGT: impaired glucose tolerance; FPG: fasting plasma glucose. Waist circumference (WC) level: 1: WC <90 cm for men and <80 cm for women; 2: WC ≥90 cm but <102 cm for men, and ≥80 cm but <88 cm for women; 3: WC ≥102 cm for men and ≥88 cm for women.

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