Table 2.
Estimates of Excess Mortality Rate per 10,000 Population and Rate Ratio Attributable to Pandemic Influenza, According to Time of Pandemic Wave and Sex, Maricopa County, Arizona, 1918–1921
| Cause of Death and Pandemic Wave | Male | Female | ||
|---|---|---|---|---|
| Excess Death Rate per 10,000 Population | RR | Excess Death Rate per 10,000 Population | RR | |
| P&I deaths | ||||
| Spring 1918 (April 1918) | 0.23 | 1.26 | 0.25 | 1.22 |
| Fall 1918 (October to December, 1918) | 63.78 | 10.32 | 48.7 | 7.85 |
| Winter 1919 (January to April 1919) | 20.89 | 3.06 | 18.67 | 2.75 |
| Winter 1920 (February 1st to April 11th, 1920) | 13.42 | 3.13 | 8.26 | 2.53 |
| Total pandemic period | 98.32 | 5.07 | 75.88 | 4.12 |
| All-cause deaths | ||||
| Spring 1918 (April 1918) | 3.5 | 1.21 | 4.77 | 1.40 |
| Fall 1918 (October to December 1918) | 67.45 | 2.22 | 49.08 | 2.22 |
| Winter 1919 (January to April 1919) | 17.17 | 1.25 | 13.0 | 1.26 |
| Winter 1920 (February 1st to April 11th, 1920) | 13.54 | 1.25 | 13.7 | 1.41 |
| Total pandemic period | 101.66 | 1.52 | 80.55 | 1.60 |
Abbreviations: P&I, pneumonia and influenza; RR, rate ratio.