Table 3.
Effects of age, sex, year, month of onset, school, migratory status, residential district and time between symptom onset and diagnosis on likelihood of being a severe case, Shenzhen, China (n = 64 428)
| Variables | P* | OR | 95% CI |
|---|---|---|---|
| Year | |||
| 2008 | 0·000 | ||
| 2009 | 0·000 | 10·866 | 3·821–30·903 |
| 2010 | 0·000 | 9·717 | 3·536–26·699 |
| 2011 | 0·000 | 14·912 | 5·459–40·735 |
| Sex (female†) | 0·574 | 0·933 | 0·732–1·189 |
| School information | |||
| Stay at home† | 0·079 | ||
| Go to school‡ | 0·009 | 0·570 | 0·373–0·871 |
| Other | 0·786 | 0·847 | 0·254–2·821 |
| Migrant (local†) | 0·000 | 2·316 | 1·602–3·347 |
| Time between onset and diagnosis (days) | 0·000 | 1·493 | 1·415–1·576 |
| Month of onset | |||
| January† | 0·000 | ||
| February | 0·993 | 0·000 | 0·000–0·000 |
| March | 0·418 | 2·478 | 0·275–22·336 |
| April | 0·097 | 5·474 | 0·734–40·830 |
| May | 0·023 | 9·943 | 1·372–72·063 |
| June | 0·032 | 8·725 | 1·201–63·372 |
| July | 0·106 | 5·176 | 0·704–38·046 |
| August | 0·052 | 7·291 | 0·983–54·091 |
| September | 0·167 | 4·152 | 0·551–31·259 |
| October | 0·334 | 2·744 | 0·354–21·246 |
| November | 0·062 | 6·811 | 0·905–51·246 |
| December | 0·159 | 4·478 | 0·555–36·129 |
| Age group (years) | |||
| ⩾5† | 0·260 | ||
| <1 | 0·521 | 0·815 | 0·435–1·524 |
| 1–<2 | 0·824 | 1·068 | 0·600–1·901 |
| 2–<3 | 0·491 | 1·228 | 0·684–2·205 |
| 3–<4 | 0·309 | 1·350 | 0·757–2·408 |
| 4–<5 | 0·899 | 0·956 | 0·477–1·916 |
| District§ | |||
| Luohu† | 0·000 | ||
| Futian | 0·088 | 1·842 | 0·912–3·719 |
| Nanshan | 0·036 | 2·389 | 1·058–5·390 |
| Longgang | 0·000 | 6·611 | 3·152–13·866 |
| Bao'an | 0·000 | 4·262 | 2·108–8·618 |
| Yantian | 0·559 | 1·481 | 0·396–5·539 |
OR, Odds ratio; CI, confidence interval.
Adjusted R2 = 0·428.
*
Italic values indicate P < 0·05.
†
Reference category.
‡
‘Go to school’ refers to any kind of school attendance 2 weeks before symptom onset (including day care, kindergarten, elementary school, secondary school).
§
Data from the cases living in the two newly established GM and PS new districts after 2010 were merged as part of data from their original BA and LG districts, respectively.