Serum γ-glutamyltransferase, alanine aminotransferase, and aspartate aminotransferase activity in Iranian healthy blood donor men

Table 3 GGT tertiles according to characteristics of the study population

	GGT
Variable	< 15	15-25	> 25	P
Age (mean ± SD), yr	38.8 ± 11.4	42.4 ± 11.2	41.3 ± 10.1	0.000 (group 1 vs group 2, 3)
Body weight (mean ± SD), kg	79.1 ± 11.2	83.8 ± 12.6	85.7 ± 13.9	0.000 (group 1 vs group 2, 3)
Height (mean ±SD), cm	174.6 ± 6.5	174.9 ± 7.0	175.1 ± 6.6	0.675
Body mass index (BMI) (mean ± SD)	25.9 ± 3.3	27.6 ± 4.3	27.9 ± 4.0	0.000 (group 1 vs group 2, 3)
Waist circumference (mean ± SD), cm	92.9 ± 9.1	96.5 ± 9.5	97.8 ± 8.9	0.000 (group 1 vs group 2, 3)
Hip circumference (mean ± SD), cm	99.2 ± 8.9	102.8 ± 9.0	103.7 ± 8.5	0.001 (group 1 vs group 2, 3)
Waist to hip ratio (WHR) (mean ± SD)	0.94 ± 0.04	0.94 ± 0.04	0.94 ± 0.05	0.103
Diabetes mellitus (% positive)	0.6	2.0	2.3	0.217
Family history of diabetes (% positive)	19.1	22.1	19.5	0.608
Family history of liver disease (% positive)	0.0	1.0	2.3	0.023
Hypertension (% positive)	2.2	2.7	3.6	0.582
Dyslipidemia (% positive)	5.1	7.1	7.2	0.486
Smoking habit (% positive)	19.49	23.29	22.7	0.471