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Table 1 Demographics of the eligible population at cohort baseline

From: Disease activity flares and pain flares in an early rheumatoid arthritis inception cohort; characteristics, antecedents and sequelae

 Categories or possible rangeEligible populationDAS28 FlarePain Flare
n 719323377
Sex% Female69%68%70%
Age (y) 56 (14)57 (13)56 (13)
Smoking% Current Smoker33%30%34%
% Ex-smoker24%25%26%
Body mass index (kg/m2) 27.7 (5.4)27.5 (5.3)27.8 (5.6)
DAS28-ESR 4.8 (1.5)4.5 (1.6)4.6 (1.6)
Erythrocyte Sedimentation Rate (mm/h) 30 (24)28 (23)31 (24)
Swollen joint count0–286 (6)6 (6)6 (6)
Tender joint count0–288 (7)7 (7)7 (7)
Visual analogue scale (mm)0–10046 (25)43 (25)44 (26)
Seropositive 58%59%58%
SF36 Bodily Pain0–10033 (11)33 (11)34 (11)
SF36 Vitality0–10041 (11)42 (11)42 (11)
SF36 Mental Health0–10046 (11)47 (11)47 (11)
HAQ0–31.2 (0.9)1.1 (0.8)1.1 (0.7)
  1. Baseline demographics at recruitment of participants who were eligible for this analysis by having at least 2 consecutive measurements of DAS28 and SF36-Bodily Pain (Eligible population) and the subgroups who were classified as experiencing flares. Seropositive; for rheumatoid factor or anti-citrullinated peptide according to local laboratory reference ranges. Mean (sd) or percent