Table 4.

Result of multivariate analysis showing significant clinical predictors for acute Q fever and calculation of Q fever score

Variable	Crude OR (95%CI)	aOR (95%CI)	β Coefficient	P- value
ALRI
No	Ref	Ref		-
Yes	3.61 (2.39–5.44)	2.68 (1.65-4.36)	0.986	<0.001
Abdominal pain
No	Ref	Ref		-
Yes	1.57 (1.01–2.42)	2.19 (1.02–4.72)	0.788	0.004
Diarrhoea
No	Ref	Ref		-
Yes	0.60 (0.28–1.29)	0.34 (0.12–0.96)	−1.075	0.042
Fever onset (>14 days)
No	Ref	Ref		-
Yes	41.52 (19.78–87.22)	37.59 (17.83–79.27)	3.627	<0.001
H-L test				0.567
ROC (AUC)	0.883 (0.851–0.915)			<0.001
Q fever score	Q fever score (rounded) = 1.0x(ALRI) + 3.6x(Symptoms onset (>14 days) + 0.8x (Abdominal pains) -1.1x(Diarrhoea).

ALRI acute lower respiratory infection, Ref referent category, aOR adjusted odds ratio, CI 95 % confidence interval, H-L test Hosmer-Lemeshow goodness- of-fit test, ROC receiver operating characteristics, AUC area under the curve