Table 1

 Baseline characteristics of the 279 patients with RA included in the study

All patientsAnti-CP positive patientsAnti-CP negative patientsDifference between groups (p)
Figures are given as median values and as proportions.
Differences between median values were analysed using the Mann-Whitney U test, whereas differences between proportions were analysed using the χ2 test.
NS  =  not significant.
Age at inclusion (years)5654.560.00.0006
Sex, % women70.3% (196/279)71.9% (115/160)68.1% (81/119)NS
Disease duration at inclusion (months)565<0.0001
RF positive (2 missing values)175/277147/15928/118<0.0001
CRP (mg/l)141613NS
ESR (mm/1st h)2123.520NS
Physicians’ assessment of disease activity (0–4)222NS
Number of swollen joints999NS
Number of tender joints768NS
Global VAS454545NS
Pain VAS4646.545NS
Number of patients starting DMARD treatment235/279129/160106/119NS