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Table 1 Baseline subject characteristics in the fracture and the BMD studies

From: Low urine pH and acid excretion do not predict bone fractures or the loss of bone mineral density: a prospective cohort study

Subject characteristics Fracture study BMD study
n 795 651
Age 59.8 +/- 12.8 58.6 +/- 12.3
Female gender, (%) 553/795 (69.6%) 455/651 (69.9%)
Women estrogen sufficient, (%) 261/553 (47.2%) 228/455 (50.1%)
Body Mass Index, kg/m2 26.1 +/- 4.7 26.0 +/- 4.7
Change of BMI, kg/m2 0.56 +/- 1.71 0.59 +/- 1.69
Physical activity, kcal/day 1548 +/- 589 1576 +/- 806
Family history of osteoporosis, (%) 71/511 (13.9%) 60/415 (14.5%)
Calcium intake, mg/day 889 +/- 550 885 +/- 551
Serum 25(OH) Vitamin D, nmol/l 75.1 +/- 28.4 74.9 +/- 28.4
Smoking, (%) 154/438 (35.2%) 113/352 (32.1%)
Caucasian race, (%) 792 (99.6%) 647 (99.4%)
Kidney Disease, (%) 119/733 (16.2%) 118/632 (18.7%)
Thiazide medications, (%) 66/795 (8.3%) 52/651 (8.0%)
Bisphosphonates, (%) 8/795 (1.0%) 6/651 (0.9%)
  1. *mean +/- sd, nmol/l = nanomole per litre