Table 3

 Single factor analysis

DescriptionORp Value (Z)
*Likelihood ratio test.
ESR, erythrocyte sedimentation rate; IAS, intra-articular steroids; DMARD, disease modifying antirheumatic drug; NSAID, non-steroidal anti-inflammatory drug; OR, odds ratio; y, years.
Age at first clinic visit (y)1.000.64
Duration of psoriasis at clinic entry (y)0.990.14
Duration of psoriatic arthritis at clinic entry (years)0.980.035
Family history of psoriasis (yes/no)0.820.25
Family history of psoriatic arthritis (yes/no)1.300.39
ESR at clinic entry (abnormal/normal)0.800.27
Rheumatoid factor at clinic entry (present/absent)1.120.66
Drug treatment
Antinuclear antibody (present/absent)0.850.41
Age at onset of psoriasis (y)1.000.43
Age at onset of arthritis (y)1.010.34
History of activity before damage (present/absent)0.920.50
History of effusion before damage (present/absent)1.120.43
Recent history of effusion (present/absent)1.730.002
Current effused joint (yes/no)1.240.16
Duration of psoriasis at time of damage (y)0.990.03
Duration of psoriatic arthritis at time of damage (y)0.980.01
ESR at time of damage (abnormal/normal)0.880.55