Changes of before-after biochemical indicators		The peer group	The contract group	T	P
Fasting blood glucose	before	9.60 ± 4.27	8.34 ± 2.52	1.78	0.07
Fasting blood glucose	after	6.23 ± 1.10	7.50 ± 1.60	−4.59	0.00
Glucose two hours after meal	before	13.70 ± 4.78	14.24 ± 4.94	−0.55	0.58
Glucose two hours after meal	after	9.74 ± 1.57	11.82 ± 2.66	−4.76	0.00
Glycosylated hemoglobin	before	8.01 ± 1.65	8.06 ± 1.52	−0.15	0.87
Glycosylated hemoglobin	after	6.22 ± 1.27	6.86 ± 1.23	−2.55	0.01
Total cholesterol and systolic blood pressure	before	5.53 ± 1.68	6.22 ± 1.69	−2.04	0.04
Total cholesterol and systolic blood pressure	after	5.12 ± 1.11	5.90 ± 1.57	−2.87	0.00
Systolic pressure	before	137.16 ± 18.41	137.34 ± 21.43	−0.04	0.96
Systolic pressure	after	132.08 ± 13.62	138.76 ± 17.38	−.13	0.03
Diastolic blood pressure	before	81.04 ± 11.22	81.94 ± 9.30	−0.43	0.66
Diastolic blood pressure	after	81.76 ± 17.43	83.90 ± 9.17	−44.76	0.44
Body mass index	before	23.91 ± 4.56	24.17 ± 3.43	−0.31	0.75
Body mass index	after	26.52 ± 1.79	24.45 ± 2.00	−1.79	0.07