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Methodologic considerations for the 11 intervention studies evaluating the impact of hand hygiene education or handwashing on reductions in respiratory and gastrointestinal illnesses
| Percentage randomized | Percentage adjusted for confounding | Percentage masked | Percentage controlled for clustering∗ |
|---|---|---|---|
| 60 | 50 | 10 | 50 |
These studies either controlled statistically for clustered units or the unit of analysis reflected the unit of measurement.
