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Table 4 Bivariate analysis (Chi 2 test) testing the association between the initial symptoms of Chikungunya infection associated with long-term arthritis on the MCA Graph and rheumatic disorders declared at 30 months by CHIKV + Patients (N = 85), Cohort of French Gendarmes (2006–2008)

From: Identification of initial severity determinants to predict arthritis after chikungunya infection in a cohort of French gendarmes

  No rheumatic disorders Arthralgiac P* Arthritisc P**
  N = 13 (15.3%) N = 33 (38.8%)   N = 39 (45.9%)  
Comorbiditya 4 (30.8) 16 (48.5) 0.447 25 (64.1) 0.076
Symptoms at acute stage - -   - -
Sick leave (yes) 3 (23.1) 17 (51.5) 0.155 28 (71.8) 0.006
Duration of absence from work >4 days 2 (15.4) 13 (39.4) 0.224 23 (59.0) 0.016
Joint swelling (yes) 2 (15.4) 9 (27.3) 0.640 21 (53.9) 0.036
Depressed moodb - 11 (33.3) 0.045 19 (48.7) 0.005
Symptoms at early chronic stage (median: 6 months after infection)   
Rheumatic symptomsc      
Arthralgia 3 (23.1) 21 (63.6) 0.025 11 (28.2) 0.122
Arthritis 2 (15.4) 4 (12.1) 0.827 22 (56.4) 0.004
Depressed moodb - 11 (33.3) 0.045 21 (53.8) 0.002
  1. *χ2 test of comparison between No rheumatic disorders and Arthralgia.
  2. **χ2 test of comparison between No rheumatic disorders and Arthritis.
  3. aHistory of at least one of the following pathologies: sprain or dislocation of joints or bones and joint diseases, before CHIK infection.
  4. bSelf-assessed mood coded as “depressed” if checked affected or totally depressed.
  5. cArthralgia = joint pain and/or stiffness. Arthritis = swelling in addition to joint pain and stiffness.