Table 3.

Univariable logistic regression

	Odds ratio	2.50%	97.50%	p
Ultrasound by a resident	4.336	3.141	5.985	< 0.001
Body habitus – overweight/obesity	1.541	1.078	2.204	0.018
Chief complaint – others	1.357	0.893	2.061	0.152
Chief complaint - fever	1.146	0.71	1.85	0.577
Age (months)	1.005	1.002	1.008	< 0.001
Boys	0.759	0.559	1.029	0.076