Table 5. Risk factors in children with influenza A (pH1N1’09) virus infection during pandemic and post-pandemic seasons.

Risk factor	Pandemic season	Post-pandemic season	p (χ2)
	n (%)	n (%)
Chronic heart disease	4 (6.25)	1 (2.3)	0.338
Asthma	6 (9.37)	3 (6.8)	0.346
Chronic obstructive pulmonary disease	4 (6.25)	0	0.091
Hypertension	1 (1.5)	3 (6.8)	0.228
Immunological disorder	6 (9.4)	8 (18.2)	0.180
Malignant disease	1 (1.5)	1 (2.3)	0.788
Chronic kidney disease	1 (1.5)	0	0.404
Neuromuscular disease	9 (14)	2 (4.5)	0.102
Diabetes mellitus	1 (1.5)	1 (2.3)	0.788
Obesity	1 (1.5)	1 (2.3)	0.404
Congenital deformity	5 (7.8)	3 (6.8)	0.845
Total	39 (60.9)	23 (52.3)