Table 1.

Characteristics of school‐aged children with influenza by asthma status

	No asthma (N = 1250)		Confirmed asthma (N = 287)		Probable asthma (N = 227)
	n	%	n	%	n	%
Age (y)
5‐8	529	42.3	107	37.3	100	44.1
9‐17	721	57.7	180	62.7	127	55.9
Male	610	48.8	171	59.6	122	53.7
Race/ethnicity
Non‐Hispanic white	1135	90.8	253	88.2	208	91.6
Hispanic	64	5.1	18	6.3	7	3.1
Other	45	3.6	14	4.9	11	4.9
Unknown	6	0.5	2	0.7	1	0.4
Medicaid coverage in past 12 mo	607	48.6	155	54.0	124	54.6
Presence of a high‐risk condition other than asthma	74	5.9	36	12.5	17	7.5
Household exposure to smokea	230	21.2	58	22.9	52	24.9
Number of outpatient visits in past 12 mo
0	86	6.9	6	2.1	12	5.3
1‐4	732	58.6	113	39.4	120	52.9
≥5	432	34.6	168	58.5	95	41.9
Influenza vaccination status
Fully vaccinated	281	22.5	117	40.8	68	30.0
Partially vaccinated	21	1.7	3	1.1	4	1.8
Unvaccinated	948	75.8	167	58.2	155	68.3
Influenza season
2007‐08	160	12.8	33	11.5	18	7.9
2008‐09	295	23.6	52	18.1	35	15.4
2010‐11	45	3.6	9	3.1	12	5.3
2011‐12	54	4.3	12	4.2	6	2.6
2012‐13	187	15.0	49	17.1	47	20.7
2013‐14	52	4.2	7	2.4	8	3.5
2014‐15	139	11.1	35	12.2	27	11.9
2015‐16	21	1.7	6	2.1	5	2.2
2016‐17	140	11.2	36	12.5	30	13.2
2017‐18	157	12.6	48	16.7	39	17.2
Influenza type/subtype
A(H1N1), seasonal	70	5.6	16	5.6	7	3.1
A(H1N1)pdm09	88	7.0	15	5.2	13	5.7
A(H3N2)	513	41.0	139	48.4	113	49.8
B	579	46.3	117	40.8	94	41.1
Duration of illness at time of enrollment (d)
0‐2	618	49.4	139	48.4	108	47.6
3‐4	451	36.1	106	36.9	73	32.2
5‐7	181	14.5	42	14.6	46	20.3
Received prescription for antivirals within 7 d after onset	83	6.6	62	21.6	28	12.3
Reported symptoms
Fatigue	1182	94.6	268	93.4	217	95.6
Fever	1150	92.0	256	89.2	205	90.3
Shortness of breathb	326	29.9	125	49.2	77	36.8
Sore throat	1005	80.4	221	77.0	181	79.7
Wheezing	300	24.0	125	43.6	84	37.0

Abbreviations: n, number; %, percentage.

^aMissing for n = 217 participants.

^bMissing for n = 211 participants.