Volume 22, Number 2—February 2016
Research
Population Effects of Influenza A(H1N1) Pandemic among Health Plan Members, San Diego, California, USA, October–December 2009
Table 1
Estimated influenza-like illness among KP members treated as outpatients in KP and non-KP facilities, San Diego, California, USA, October–December 2009*
| Characteristics | Total population |
Rate per 100,000 members |
||||||
|---|---|---|---|---|---|---|---|---|
| October | November | December | Mean | October | November | December | ||
| KP health plan population, San Diego | 495,718 | 494,911 | 494,947 | 495,192 | 100,000 | 100,000 | 100,000 | |
| Estimated infections (20% attack rate) | 99,144 | 98,982 | 98,989 | 99,038 | 20,000 | 20,000 | 20,000 | |
| Number who accessed IPH | 2,439 | 3,202 | 1,038 | NA | 492 | 647 | 209 | |
| Number of outpatients diagnosed with pneumonia | 69 | 124 | 26 | NA | 13.9 | 25.1 | 5.3 | |
| Number of outpatients diagnosed with pneumonia by chest radiograph | 31 | 57 | 17 | NA | 6.3 | 11.5 | 3.4 | |
| Number of outpatients diagnosed with pneumonia, OOHPC | 23 | 17 | 18 | NA | 4.6 | 3.4 | 3.6 | |
| Number of outpatients diagnosed with pneumonia by chest radiograph, OOPHC | ND | ND | ND | NA | ND | ND | ND | |
| Number of outpatients diagnosed with pneumonia | 92 | 141 | 44 | NA | 18.5 | 28.5 | 8.9 | |
*IPH, in-plan health care; KP, Kaiser Permanente; OOPHC, out-of-plan health care; NA, not applicable; ND, no data available.
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