Table 6 Arithmetic mean differences in morning peak expiratory flow (PEF, end of trial minus baseline) and geometric mean end of trial/baseline ratios for PEF variability.
| Outcome | N | Difference/GM ratio (95% CI) | p Value |
|---|---|---|---|
| Mean morning PEF (l/min) | |||
| Placebo | 98 | −2.25 (−15.01 to 10.52) | 0.73 |
| Selenium | 99 | 5.19 (−9.40 to 19.79) | 0.48 |
| Selenium‐placebo difference | 197 | 7.44 (−11.95 to 26.83) | 0.45 |
| Mean PEF amplitude (% mean) | |||
| Placebo | 98 | 0.97 (0.88 to 1.08) | 0.62 |
| Selenium | 99 | 0.92 (0.82 to 1.04) | 0.19 |
| Selenium/placebo ratio | 197 | 0.95 (0.81 to 1.11) | 0.52 |