Arthritis Research & Therapy

Table 1 Basic descriptive statistics of the studied sample (N = 574) of Chuvasians

From: Association of ENPP1gene polymorphisms with hand osteoarthritis in a Chuvasha population

Trait, by age group (years)	Males					Females
	Valid n	Mean	Minimum	Maximum	SD	Valid n	Mean	Minimum	Maximum	SD
Age (years)
<30	74	24.716	18	29	2.855	70	24.429	18	29	2.942
30–44	75	35.507	30	44	3.786	65	36.123	30	44	4.502
45–59	56	52.696	45	59	4.164	70	52.171	45	59	4.619
≥60	89	66.045	60	89	5.054	75	66.253	60	90	5.149
Weight (kg)
<30	74	62.009	48.0	81.6	7.634	69	52.199	35.5	86.5	9.601
30–44	75	66.741	46.2	98.1	10.887	65	61.711	42.3	95.8	12.501
45–59	56	68.230	49.9	100.1	12.670	69	64.691	46.3	92.3	10.893
≥60	88	62.640	41.1	94.2	12.122	71	63.632	38.1	101.3	13.777
Height (m)
<30	74	1.692	1.525	1.880	0.064	69	1.571	1.466	1.775	0.062
30–44	75	1.682	1.507	1.894	0.074	64	1.564	1.457	1.694	0.045
45–59	56	1.652	1.534	1.77	0.051	70	1.538	1.424	1.655	0.049
≥60	88	1.620	1.483	1.727	0.057	71	1.502	1.389	1.654	0.052
BMI (kg/m²)
<30	74	21.661	17.28	28.69	2.432	69	21.074	15.78	31.23	3.136
30–44	75	23.509	18.86	32.46	2.925	64	25.141	17.65	39.77	5.019
45–59	56	24.942	18.875	36.225	4.086	69	27.332	19.123	36.880	4.237
≥60	88	23.813	16.28	33.30	3.983	71	28.108	17.63	43.25	5.357
OA score^a (K–L score)
<30	74	7.321	0	24	5.838	70	7.943	0	24	5.728
30–44	74	14.108	0	32	7.526	64	16.516	0	30	7.229
45–59	56	26.932	6	49	8.802	70	28.914	9	49	7.001
≥60	89	34.870	16	51	6.762	72	35.834	14	51	6.271
FS1-OA^b
<30	74	-1.119	-1.707	0.200	0.466	70	-1.066	-1.707	0.214	0.465
30–44	74	-0.579	-1.707	0.784	0.596	64	-0.384	-1.707	0.709	0.574
45–59	56	0.408	-1.287	2.144	0.682	70	0.565	-1.122	2.081	0.534
≥60	87	1.002	-0.446	2.194	0.506	71	1.062	-0.577	2.209	0.459

^aObserved total score for 14 joints, following Kellgren–Lawrence (K–L) atlas [19]. The scores for left and right hand were averaged. ^bStandardized factor score that resulted from principal component analysis of 28 joints of both hands. BMI, body mass index; FS1-OA, first factor score obtained from principal component analysis of osteoarthritis (OA); SD, standard deviation.

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