Table 2.

Medical cares for influenza-like illness (ILI) of 48 severe acute respiratory infection (sARI) cases and 79 ILI controls infected with pH1N1 influenza

Variables	Number exposed		Percent exposed		Adjusted p-valueb
	Case (Na = 48)	Control (N = 79)	Case	Control
Level of clinic of first visit:					0.67
Village	3	7	6.3	8.9
Primary care	15	18	31.3	22.8
Secondary care outpatient	3	4	6.3	5.1
Tertiary care outpatient	24	40	50.0	50.6
Above Tertiary care outpatient	3	10	6.3	12.7
Saw a doctor before sARI*	48	71	100.0	89.9	0.06
Clinic visits before sARI*					0.50
1	19	39	39.6	49.4
2	20	29	41.7	36.7
≥3	10	11	20.8	13.9

N^a = 48: Exclude 2 hospital acquired patients. Adjusted p-value^b: adjusted for age group and underlying disease using conditional logistic regression. * We applied the time interval from ILI onset to sARI onset of the case to the matched controls to impute sARI onset for control patients