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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 scorea (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-OAb           
   <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
  1. 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.