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Summary of outcomes during 12/31/2007–4/18/2008 by intervention arm in the PIPP study of NPI effectiveness in the 2007–2008 winter season. Five schools were in each intervention arm.
| Intervention Arm | Population Size | # of Subjects with ≥ 1 ILI | # of ILI episodes | Influenza Lab-test result
|
|||
|---|---|---|---|---|---|---|---|
| A | B | Negative | Untested | ||||
| NPI | 1999 | 162 | 173 | 21 | 31 | 70 | 51 |
| Control | 1960 | 190 | 207 | 32 | 19 | 97 | 59 |
