Table 1.
Characteristics of children with mild and moderate-to-severe influenza at Kaiser Permanente Northern California, 2013–2014 influenza season.
| Characteristic | Mild, n = 567 (%) |
Moderate-to-severe, n = 538 (%) |
|---|---|---|
| Sex | ||
| Male | 293 (51.7) | 293 (54.5) |
| Female | 274 (48.3) | 245 (45.5) |
| Age | ||
| <6 months | 24 (4.2) | 33 (6.1) |
| ≥6 to <36 months | 104 (18.3) | 189 (35.1) |
| ≥3 to <9 years | 212 (37.4) | 177 (32.9) |
| ≥9 to <18 years | 227 (40.0) | 139 (25.8) |
| Race | ||
| Asian | 100 (17.6) | 95 (17.7) |
| Black | 44 (7.8) | 45 (8.4) |
| Hispanic | 184 (32.5) | 185 (34.4) |
| Multiracial | 33 (5.8) | 41 (7.6) |
| Native American | 2 (0.4) | 1 (0.2) |
| Pacific Islander | 4 (0.7) | 2 (0.4) |
| Unknown/Other | 7 (1.2) | 4 (0.7) |
| White | 193 (34.0) | 165 (30.7) |
| Vaccinated in Current Season | ||
| Yes | 115 (20.3) | 121 (22.5) |
| No | 452 (79.7) | 417 (77.5) |
| Influenza Vaccine Primed | ||
| Yes | 183 (32.3) | 166 (30.9) |
| No | 230 (40.6) | 229 (42.6) |
| Unknown | 154 (27.2) | 143 (26.6) |
| Comorbidities Presenta | ||
| Asthma | 93 (16.4) | 100 (18.6) |
| Asthma within 90 Daysb | 21 (3.7) | 40 (7.4) |
| Cystic Fibrosis | 0 (0) | 0 (0) |
| Congenital Anomalies | 78 (13.8) | 93 (17.3) |
| Diabetes Mellitus | 1 (0.2) | 5 (0.9) |
| Chronic Otitis Media | 4 (0.7) | 6 (1.1) |
| Renal Disorders | 1 (0.2) | 4 (0.7) |
| Hepatic Disorders | 8 (1.4) | 8 (1.5) |
| Neurological/Neuromuscular Disorders | 10 (1.8) | 18 (3.3) |
| Other Metabolic Disorders | 14 (2.5) | 25 (4.6) |
| History of Prematurity (<32 weeks) | 19 (3.4) | 39 (7.2) |
| Number of Comorbidities | ||
| None | 381 (67.2) | 326 (60.6) |
| 1–2 Comorbidities | 178 (31.4) | 194 (36.1) |
| >2 Comorbidities | 8 (1.4) | 18 (3.3) |
| Influenza Type & RSV Co-Infection | ||
| Influenza A only | 486 (85.7) | 462 (85.9) |
| Influenza A with RSV | 1 (0.2) | 14 (2.6) |
| Influenza B only | 80 (14.1) | 60 (11.2) |
| Influenza B with RSV | 0 (0) | 2 (0.4) |
| Specimen Collection | ||
| Early (Prior to Jan 12, 2014) | 261 (46.0) | 280 (52.0) |
| Late (On or after Jan 12, 2014) | 306 (54.0) | 258 (48.0) |
aIndividual comorbidity categories are not mutually exclusive.
b“Asthma within 90 days” is a subset of the “Asthma” category.
RSV: respiratory syncytial virus.