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

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)

	No rheumatic disorders	Arthralgia^c	P*	Arthritis^c	P**
	N = 13 (15.3%)	N = 33 (38.8%)		N = 39 (45.9%)
Comorbidity^a	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 mood^b	-	11 (33.3)	0.045	19 (48.7)	0.005
Symptoms at early chronic stage (median: 6 months after infection)
Rheumatic symptoms^c
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 mood^b	-	11 (33.3)	0.045	21 (53.8)	0.002

^*χ2 test of comparison between No rheumatic disorders and Arthralgia.
**^χ2 test of comparison between No rheumatic disorders and Arthritis.
^aHistory of at least one of the following pathologies: sprain or dislocation of joints or bones and joint diseases, before CHIK infection.
^bSelf-assessed mood coded as “depressed” if checked affected or totally depressed.
^cArthralgia = joint pain and/or stiffness. Arthritis = swelling in addition to joint pain and stiffness.

ISSN: 1471-2474