Table 3.
Parameter estimates (95% confidence intervals) for the seasonal effects on percent predicted FEV1 and p-values from the Likelihood ratio test.
| Parameters | Denmark |
UK |
|||
|---|---|---|---|---|---|
| Estimates | p-value | Estimates | p-value | ||
| Categorical ‘season’ variable (percentage points; reference level = winter) | Spring | 0.01 (−0.15 to 0.18) | 0.34 | 0.34 (0.1 to 0.58) | 0.06 |
| Summer | 0.1 (−0.07 to 0.28) | 0.21 (−0.04 to 0.45) | |||
| Autumn | 0.13 (−0.03 to 0.2) | 0.17 (−0.06 to 0.39) | |||
| Amplitude of sine wave (percentage points) | 0.1 (0 to 0.21) | 0.07 | 0.14 (0 to 0.29) | 0.07 | |
| Horizontal shift of sine wave (days) | 148.47 (−182.32 to 182.61) | 66.2 (−182.25 to 179.51) | |||