Table 1. Characteristics of monozygotic twins discordant for type 2 diabetes.

	Non-diabetic	Type 2diabetic	P
n (male/female)	12 (6/6)	12 (6/6)	.
Age (years)	68.3±7.7	68.3±7.7	1.0
BMI (kg/m2)	30.2±6.3	32.3±6.4	0.02
Fasting plasma glucose(mmol/l)	6.4±0.5	10.5±2.0	<0.001
Fasting serum insulin (pmol/l)	78.9±55.2	95.6±52.3	0.3
Blood hemoglobin A1c (%)	6.0±0.5	7.7±1.4	0.001

Data are shown as mean±standard deviation.