Table 1

 Demographic data and disease characteristics at baseline (mean (SD) for continuous variables, count (%) for categorical variables)

Azithromycin (n = 81)Placebo (n = 71)p Value*
*Two sample t test. †azithromycin—35 patients and placebo—30 patients tested.
Age (years)33.0 (9.8)34.7 (8.9)0.28
Duration of arthritis (days)30.1 (17.3)30.7 (17.9)0.85
Women25 (31)24 (34)0.70
Previous similar episode17 (21)15 (21)0.92
Recent intra-articular steroid injection20 (25)17 (24)0.98
Heel enthesopathy28 (35)30 (42)0.33
Urethritis (symptom)13 (16)12 (17)0.86
Diarrhoea (symptom)5 (6)2 (3)0.33
Skin abnormalities11 (14)10 (14)0.93
Eye abnormalities17 (21)14 (20)0.85
Genitourinary abnormalities19 (24)17 (24)0.97
HLA-B27†22 (63)12 (41)0.09