Table 4.
The average measured values of FEV1 expressed as a per cent of average of normal values for that group of patients at first and last examination according to the number of exacerbations of illness per year
| Average number of exacerbations per year | Firstexam. | Lastexam. | Difference | Significance | |
|---|---|---|---|---|---|
| 1exacerbation or less | _X | 43.91 | 44.05 | +0.14 | non signif. |
| S.D. | 13.83 | 17.05 | 16.08 | ||
| 2-3 exacerbations | _X | 36.99 | 33.22 | -3.77 | p=0.05 |
| S.D. | 11.36 | 13.48 | 14.69 | ||
| More than 3 exacerbations | _X | 33.89 | 28.30 | -5.59 | p=0.01 |
| S.D. | 10.95 | 11.14 | 11.99 | ||
| All patients | X | 38.26 | 35.20 | -3.06 | p=0.05 |
| S.D. | 12.78 | 14.61 | 14.42 |