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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).