Volume 25, Number 6—June 2019
Research
Respiratory Syncytial Virus Seasonality, Beijing, China, 2007–2015
Table 1
Demographic characteristics of hospitalized children with pneumonia, Beijing, China, July 1, 2007–June 30, 2015, by respiratory syncytial virus year*
| Characteristics | 2007–08 | 2008–09 | 2009–10 | 2010–11 | 2011–12 | 2012–13 | 2013–14 | 2014–15 | p value |
|---|---|---|---|---|---|---|---|---|---|
| No. patients |
718 |
693 |
522 |
650 |
495 |
438 |
427 |
282 |
|
| Sex | |||||||||
| M | 455 (63) | 418 (60) | 363 (70) | 387 (60) | 309 (62) | 260 (59) | 251 (59) | 161 (57) | 0.003 |
| F |
263 (37) |
275 (40) |
159 (30) |
263 (40) |
186 (38) |
178 (41) |
176 (41) |
121 (43) |
|
| Age, y, median (IQR) |
0.7 (0.2–3.8) |
0.9 (0.3–3.3) |
0.8 (0.2–2.7) |
2 (0.6–6.1) |
1.4 (0.4–6.1) |
2.2 (0.5–7.3) |
5 (2.1–8.6) |
3.8 (0.6–7.5) |
<0.001 |
| Age group, mo† | <0.001 | ||||||||
| 1–5 | 304 (42) | 228 (33) | 210 (40) | 140 (22) | 147 (30) | 108 (25) | 38 (9) | 60 (21) | |
| 6–11 | 127 (18) | 154 (22) | 89 (17) | 84 (13) | 68 (14) | 60 (14) | 28 (7) | 28 (10) | |
| 12–23 | 54 (8) | 94 (14) | 71 (14) | 104 (16) | 69 (14) | 48 (11) | 39 (9) | 19 (7) | |
| 24–59 | 78 (11) | 82 (12) | 61 (12) | 118 (18) | 60 (12) | 63 (14) | 110 (26) | 55 (20) | |
| >60 |
155 (22) |
135 (19) |
91 (17) |
204 (31) |
151 (31) |
159 (36) |
212 (50) |
120 (43) |
|
| Underlying medical condition | 68 (9) | 103 (15) | 65 (12) | 88 (14) | 71 (14) | 44 (10) | 32 (7) | 22 (8) | <0.001 |
| History of prematurity‡ | 8 (1) | 23 (3) | 24 (5) | 36 (6) | 29 (6) | 27 (6) | 22 (5) | 13 (5) | <0.001 |
| Congenital heart disease§ | 49 (7) | 76 (11) | 38 (7) | 47 (7) | 38 (8) | 13 (3) | 10 (2) | 7 (2) | <0.001 |
| Chronic lung diseases¶ | 6 (1) | 5 (1) | 2 (0) | 6 (1) | 4 (1) | 3 (1) | 0 | 2 (1) | 0.700 |
| Anemia# | 5 (1) | 2 (0) | 5 (1) | 4 (1) | 1 (0) | 3 (1) | 0 | 1 (0) | 0.424 |
| Malnutrition | 5 (1) | 2 (0) | 2 (0) | 3 (0) | 0 | 1 (0) | 0 | 0 | 0.337 |
| Chromosomal anomalies** | 2 (0) | 1 (0) | 0 | 0 | 0 | 0 | 0 | 0 | 0.441 |
*Values are no. (%) except where indicated. IQR, interquartile range.
†Some columns do not add up to 100% because of rounding.
‡Prematurity was defined as birth at gestational age <37 weeks.
§Congenital heart disease (defined as International Classification of Diseases, Ninth Revision, codes 745.xx, 746.xx, or 747.xx) was diagnosed at hospital admission.
¶For example, bronchopulmonary dysplasia.
#Moderate to severe anemia, defined as hemoglobin <90 g/L at hospital admission.
**For example, Down syndrome.
1These authors contributed equally to this article.
2These senior authors contributed equally to this article.