Table 6.
Increases in post neonatal mortality connected with being born in time periods which put infants at risk during the 1918–19 influenza epidemic in Derbyshire: different causes of death examined separately
| Odds ratios associated with periods of birtha | |||
|---|---|---|---|
| Born in 1918 | Born in Feb. 1918 | Born July–Sept. 1918 | |
| All causes | 1.500*** | 1.668* | 1.935*** |
| Infectious disease (incl. influenza) | 2.549*** | 5.815*** | 2.576*** |
| Wasting diseases | 1.946*** | 2.269 | 4.647*** |
| Bronchitis and pneumonia | 1.331 | 0.992 | 0.851 |
| Diarrhoeal diseases | 0.824 | 0.000 | 1.468 |
| Convulsions | 1.509 | 1.253 | 2.656** |
| Other causes | 0.995 | 0.772 | 1.192 |
a
Odds ratios give the multiplicative increase in mortality associated with period of birth, compared to a value of 1.000 for all other months in the period 1917–1922. Each odds ratio is derived from a separate multivariate hazards analysis, in which other variables are also controlled (see text for details).
***
Significant at 1% level.
**
Significant at 5% level.
*
Significant at 10% level.
Source:Derbyshire health visitor data.