Table 1

Univariable logistic regression analysis of the relation of individual ICPC codes with IA development

ICPCDescriptionGroupORCIP value
L20Joint symptom/complaint NOSMusculoskeletal8.15.8–11.3<0.01
L97Chronic internal derangement kneeMusculoskeletal5.91.6–21.8<0.01
L11Wrist symptom/complaintMusculoskeletal4.93.2–7.5<0.01
NAOther infectious symtomsInfections4.91.5–15.7<0.01
L12Hand/finger symptom/complaintMusculoskeletal4.03.1–5.1<0.01
S91PsoriasisChronic disease3.72.5–5.4<0.01
D94Chronic enteritis/ulcerative colitisChronic disease3.51.9–6.4<0.01
T92GoutChronic disease3.52.6–4.7<0.01
L29Symptom/complaint musculoskeletal otherMusculoskeletal2.91.9–4.4<0.01
N93Carpal tunnel syndromeMusculoskeletal2.71.9–4.0<0.01
L92Shoulder syndromeMusculoskeletal2.62.0–3.4<0.01
L91Osteoarthrosis otherChronic disease2.61.9–3.5<0.01
L19Muscle symptom/complaint NOSMusculoskeletal2.51.6–4.0<0.01
B80Iron deficiency anaemiaRA-related diseases2.41.6–3.6<0.01
B81Anaemia, vitamin B12/folate deficiencyRA-related diseases2.41.5–3.6<0.01
  • After correction for multiple testing using -falsepositive rate control, none of these variables lost their significance.

  • IA, inflammatory arthritis; ICPC, International Classification of Primary Care; NA, not applicable; NOS, not otherwise specified; RA, rheumatoid arthritis.