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Table 1 Baseline characteristics of the study population according to treatment group

From: The effect of zoledronic acid on type and volume of Modic changes among patients with low back pain

Characteristics Total Zoledronic acid n = 19 Placebo n = 20
Sex, n (%) men 25 (64.1) 14 (73.7) 11 (55.0)
Age, mean (SD) years 50.4 (8.4) 49.4 (9.5) 51.5 (7.3)
Smoking, n (%) regular smokersa 11 (28.2) 5 (26.3) 6 (30.0)
BMI, mean (SD) kg/m 26.8 (3.2) 26.2 (3.3) 27.4 (3.2)
Duration of LBP, median (IQ range) days 315 (212, 365) 330 (200, 365) 300 (270, 365)
Intensity of LBP, mean (SD)b 6.6 (1.5) 6.5 (1.4) 6.8 (1.6)
Oswestry Disability Index, mean % (SD) 32.9 (10.4) 30.7 (10.9) 34.9 (9.8)
Duration of sick leave during the past year, median (IQ range) days 20 (0, 65) 20 (0, 50) 18 (1, 181)
  1. BMI Body Mass Index, LBP low back pain, SD standard deviation, IQ inter-quartile
  2. aSmoking at least one cigarette/day
  3. bAssessed using a 10-cm Visual Analogue Scale (VAS)