Table 1.

Comparison of baseline data (x̅±s; n, %)

Baseline data		Case group (n=100)	Control group (n=100)	t/χ2	P
Age (months)		12.64±3.45	12.31±3.57	0.529	0.598
Gender	Male	53 (53)	55 (55)	0.081	0.777
	Female	47 (47)	45 (45)
Duration of illness (d)		4.17±0.38	4.18±0.41	0.179	0.858