Mean (SD) V′maxFRC (ml/s) and size adjusted V′maxFRC (ml/s/cm) in 30 infants who have wheezed on at least one occasion during the first year of life according to frequency/pattern of reported wheeze symptoms, with mean differences and 95% confidence intervals of mean difference
| Yes | No | Mean difference (95% CI) | p value* | |
|---|---|---|---|---|
| V′maxFRC=maximum flow at functional residual capacity. *Independent t test. | ||||
| Wheeze more than once | n=21 | n=9 | ||
| V′FRC | 72.2 (37.5) | 111.8 (53.7) | 39.6 (4.7 to 74.5) | 0.028 |
| Size adjusted V′maxFRC | 1.30 (0.67) | 2.02 (0.95) | 0.72 (0.10 to1.35) | 0.01 |
| Wheeze with colds | n=27 | n=3 | ||
| V′FRC | 85.9 (47.7) | 67.7 (22.5) | –18.2 (–76.0 to 39.6) | 0.52 |
| Size adjusted V′maxFRC | 1.55 (0.85) | 1.21 (0.40) | –0.34 (–1.37 to 0.70) | 0.51 |
| Wheeze apart from colds | n=10 | n=20 | ||
| V′FRC | 84.5 (49.1) | 83.8 (45.6) | –0.71 (–37.8 to 36.4) | 0.97 |
| Size adjusted V′maxFRC | 1.50 (0.89) | 1.52 (0.81) | 0.027 (–0.64 to 0.69) | 0.94 |