Table 1

Demographic and disease characteristics of study subjects at first visit

VariableEarly PsA >2 yearsLate PsA >2 yearsp Value
No of patients436641
Sex F/M (%)42.4/57.644.8/55.20.447
Age at psoriasis diagnosis (years)30.327.20.001
Age at PsA diagnosis (years)40.334.2<0.0001
Age at first visit (years)41.145.2<0.0001
Duration of PsA at first visit (years)0.9211.0<0.0001
Education status at first visit
High school or less100 (30.0%)127 (28.2%)0.5818
College or university233 (70.0%)323 (71.8%)
Axial and peripheral disease93 (24.2%)197 (35.1%)0.02
Axial disease only13 (3.4%)22 (3.9%)
Peripheral disease only278 (72.4%)342 (60.9%)
Mean no of actively inflamed joints10.511.70.239
Mean no of damaged joints3.59.2<0.0001
Mean PASI score6.25.50.254
Sacroiliitis26.4%38.4%<0.0001
Radiographic damage39.2%65.9%<0.0001
Treatment at first visit56.4%61.6%0.089
NSAID28.0%56.8%<0.0001
DMARD biological agents4.1%6.7%0.061
  • DMARD, disease-modifying antirheumatic drug; NSAID, non-steroidal anti-inflammatory drug; PASI, psoriasis area and severity index; PsA, psoriatic arthritis.