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Table 1 Characteristics of the study population by their osteoarthritis (OA) status

From: Vitamin D receptor gene polymorphisms and susceptibility of hand osteoarthritis in Finnish women

OA category n (%) Age [mean ± SD] (years)* Body mass index [mean ± SD] (kg/m2) Daily calcium intake [mean ± SD] (mg) Occupation Hormone therapy Smoking status
       Dentists (n) Teachers (n) Ever used (n) Never used (n) Ever smoked (n) Never smoked (n)
Overall No 383 (71%) 53.0 ± 5.2 24.3 ± 3.5 663.2 ± 356.3 223 160 187 196 88 297
  Yes 160 (29%) 56.3 ± 4.7 25.0 ± 3.8 707.7 ± 403.8 72 (24%) 88 (35%) 103 (35%) 57 (22%) 33 (28%) 127 (30%)
Symmetrical No 431 (79%) 53.3 ± 5.2 24.3 ± 3.5 673.4 ± 363.2 245 186 216 215 99 332
  Yes 110 (21%) 56.5 ± 4.6 25.1 ± 3.8 688.1 ± 403.8 48 (16%) 62 (25%) 72 (25%) 38 (15%) 20 (17%) 90 (21%)
Osteophyte No 504 (93%) 53.6 ± 5.2 24.4 ± 3.6 669.4 ± 371.0 272 232 264 240 113 391
  Yes 39 (7%) 57.9 ± 4.1 25.2 ± 3.5 765.3 ± 365.2 23 (8%) 16 (6%) 26 (9%) 13 (5%) 6 (5%) 33 (8%)
  1. *P = 0.0001 for the comparison between hand OA status groups (Student's t test). P = 0.01 for the comparison between the persons with and without overall OA, and for the comparison between persons with and without symmetrical OA (Student's t test). P = 0.004 for the comparison between the persons with and without overall OA, and for the comparison between persons with and without symmetrical OA (Student's t test).