Table 1.

Clinical characteristics of the 43 twin pairs in our study.

variable	full description	unit	min	max	range	mean	variance	min within pair difference	max within pair difference
adiponectin	fasting plasma adiponectin concentration	ng ml−1	1236.55	9576.3	8339.75	3172.58	2361015.58	60	5644.57
age	age at sampling	year	22.78	36.1	13.32	30.62	15.7	NA	NA
alat	fasting plasma alanine aminotransferase	U/l	10	103	93	28.93	281.95	0	62
asat	fasting plasma aspartate aminotransferase	U/l	14	63	49	26.69	67.28	0	34
bmi	body mass index	kg m−2	19.68	48.58	28.9	27.5	28.82	0.06	10.22
bpdiastolic	diastolic blood pressure	mmHg	48	96	48	72.22	90.53	0	22
bpsystolic	systolic blood pressure	mmHg	96	158	62	125.11	193.81	0	34
crp	C-reactive protein	mg l−1	1.33	132.76	131.43	19.62	668.13	0	72
diabetes	presence of diabetes	0 = no, 1 = yes	0	2	2	0.02	0.05	0	2
fatkg	fat mass	kg	7.73	69.71	61.98	27.53	145.13	0.08	22.77
fatp	percentage body fat	%	10.3	56.3	46	33.52	96.29	0.1	19.2
ffmkg	fat free mass	kg	31.67	73.08	41.41	50.83	111.81	0.01	9.76
FLI	fatty liver index [33]		0.03	51.54	51.51	3.85	94.78	0	44.09
gender	sex	male = 0, female = 1	0	1	1	0.53	0.25	NA	NA
gluk0	fasting plasma glucose concentration	mmol l−1	4	9.8	5.8	5.27	0.49	0	4.2
gt	fasting plasma gamma glutamyl transferase concentration	U/l	10	195	185	28.69	1066.63	0	107
hdl	fasting plasma high density lipoprotein concentration	mmol l−1	0.52	3.04	2.52	1.46	0.21	0	0.97
height	height	cm	152	196.5	44.5	171.26	102.11	0	6
homa	HOMA index		0.35	7.94	7.59	1.47	1.36	0	6
hr0	heart rate	beats min−1	44	110	66	70.94	124.15	0	66
iafat	intra-abdominal fat volume	cm3	95	5878	5783	1170.69	1023096.35	23.11	2186.49
igt	impaired glucose tolerance		0	1	1	0.15	0.13	0	1
insu0	fasting plasma insulin concentration	mU l−1	1.4	28.8	27.4	6.23	19.27	0	21.3
col	fasting plasma total cholesterol	mmol l−1	2.7	6.9	4.2	4.52	0.76	0	2.7
ldl	fasting plasma low density lipoprotein concentration	mmol l−1	0.98	5.1	4.12	2.71	0.67	0	2.8
leisure	leisure time index [34]		1.5	4	2.5	2.81	0.34	0	1.25
leptin	fasting plasma leptin concentration	pg ml−1	467.58	77640	77172.42	19330.95	362561870.3	510	38361.3
LFS	liver fat score [35]		-3.71	3.41	7.12	-1.67	1.58	0.04	4.01
liver fat	liver fat percentage	%	0.14	24.25	24.11	2.94	21.09	0.01	15.38
liver.fat.%.prediction	liver fat percentage prediction [35]		0.65	13.93	13.28	2.82	5.74	0.02	10.41
liverfat.disc	discordant for liver fat	0 = no, 1 = yes	0	1	1	0.48	0.26	NA	NA
matsuda	Matsuda index [36]		0.84	22.71	21.87	8.64	25.28	0.06	17.78
scfat	subcutaneous fat volume	cm3	1072.56	11734.1	10661.54	4208.71	4351562.18	31.8	3809
smoking.current	current smoker	0 = no, 1 = yes	0	1	1	0.31	0.22	0	1
smoking.former	former smoker	0 = no, 1 = yes	0	1	1	0.3	0.21	0	1
smoking.never	smoking never	0 = no, 1 = yes	0	1	1	0.38	0.24	0	1
sport	sport index		1	5	4	2.73	1.06	0	3
tg	fasting plasma triglycerides	mmol l−1	0.37	4.37	4	1.1	0.43	0	2.2
total	total physical activity index		4.62	11.62	7	8.28	2.59	0.12	3.75
waist	waist circumference	cm	65.2	123	57.8	89.76	166.33	0.1	32
weight	body weight	kg	48.7	127.8	79.1	80.87	300.13	0.6	29.1
work	work physical activity index		1.5	4.88	3.38	2.74	0.68	0	2
year	study year		2006	2013	7	2009.51	5.05	NA	NA