Impact of HbA1c criterion on the definition of glycemic component of the metabolic syndrome: the China health and nutrition survey 2009

Table 2 Proportions of metabolic syndrome (MetS) by fasting plasma glucose only, HbA1c only, and by both criteria

	MetS by either FPG or HbA1c	FPG-based diagnosis of MetS	HbA1c-based diagnosis of MetS	MetS by both FPG and HbA1c (overlap^*)
Sex
Men	893	179 (20.0)	353 (39.5)	361 (40.4)
Women	1115	189 (17.0)	519 (46.5)	407 (36.5)
Age, y
18-44	377	88 (23.3)	176 (46.7)	113 (30.0)
45-64	1112	214 (19.2)	475 (42.7)	423 (38.0)
≥ 65	519	66 (12.7)	221 (42.6)	232 (44.7)
BMI categories
< 25 kg/m²	908	189 (20.8)	409 (45.0)	310 (34.1)
25-30 kg/m²	902	148 (16.4)	395 (43.8)	359 (39.8)
≥ 30 kg/m²	198	31 (15.7)	68 (34.3)	99 (50.0)
WC categories
< 85/80 cm	235	44 (18.7)	119 (50.6)	72 (30.6)
≥ 85/80 cm	1773	324 (18.3)	753 (42.5)	696 (39.3)
BP status
< 120/80 mmHg	200	46 (23.0)	101 (50.5)	53 (26.5)
120/80-140/90 mmHg	803	150 (18.7)	346 (43.1)	307 (38.2)
≥140/90 mmHg	1005	172 (17.1)	425 (42.3)	408 (40.6)
Settings
Urban	669	146 (21.8)	287 (42.9)	236 (35.3)
Rural	1339	222 (16.6)	585 (43.7)	532 (39.7)
Regions
Southern	920	224 (24.3)	392 (42.6)	304 (33.0)
Northern	1088	144 (13.2)	480 (44.1)	464 (42.6)
Education
Primary or below	1038	171 (16.5)	471 (45.4)	396 (38.2)
Less than high school	573	121 (21.1)	232 (40.5)	220 (38.4)
High school or above	397	76 (19.1)	169 (42.6)	152 (38.3)

^*Proportions of overlap between HbA1c- and FPG-based diagnosis of MetS are calculated as the number of MetS by both FPG and HbA1c divided by the number of MetS based on either FPG or HbA1c.
FPG, fasting plasma glucose; BMI, body mass index; WC, waist circumference; BP, blood pressure.

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