Table 4.
Demographic characteristics and underlying medical conditions of pediatric severe, acute respiratory infection patients with laboratory‐confirmed influenza with and without radiographic diagnosis of pneumonia, Jingzhou, China, April 5, 2010 to April 8, 2012
| Characteristics of influenza patientsa | Case patients with pneumonia (n=246) (%) | Case patients without pneumonia (n=561) (%) | P‐valueb |
|---|---|---|---|
| Male sex | 145 (59) | 332 (59) | .950 |
| Median (IQR) age (years) | 2.3 (0.9–3.7) | 2.2 (1.0–4.0) | .542 |
| Age group: | |||
| <6 mo | 29 (12) | 50 (9) | |
| 6–11 mo | 38 (15) | 87 (16) | |
| 12–23 mo | 43 (18) | 124 (22) | |
| 2–4 y | 105 (43) | 195 (35) | |
| 5–9 y | 26 (11) | 90 (16) | |
| 10–15 y | 5 (2) | 15 (3) | |
| At least one underlying medical condition | 7 (3) | 9 (2) | .275 |
| Prematurityc | 2/110 (2) | 4/261 (2) | .744 |
| Low birthweightd | 1/110 (1) | 5/261 (2) | .705 |
| Vaccination historye | |||
| Received monovalent pandemic H1N1 vaccinationf | 0 | 2/132 (2) | 1.000 |
| Received seasonal trivalent influenza vaccinationg | 31/133 (23) | 37/256 (15) | <.05 |
| Exposure history | |||
| At least one tobacco smoker in household | 37/160 (23) | 102/322 (32) | .051 |
IQR, interquartile range.
Data presented as no. (%) of patients unless otherwise indicated. Denominators for testing of fewer patients than full group are indicated. Percentages may not total 100 because of rounding. Data did not include patients without specimens for influenza virus testing.
The P‐values are comparisons between “pediatric influenza patients with pneumonia” and “pediatric influenza patients without pneumonia”, and statistically significant as P<.05.
Defined as gestational age <37 wk at birth for children aged <2 y.
Defined as birth weight of a live born infant of <2500 g for children aged <2 y.
Answered “Yes” to this question, “During the past 12 mo, have you had a flu shot?” which were asked during a face‐to‐face interview.
Of children aged ≥6 mo eligible to receive seasonal trivalent inactive influenza vaccine.
Of children aged ≥6 mo eligible to receive monovalent pandemic A (H1N1) influenza vaccine.