Lung function results according to reported cough symptoms
| Yes | No | Mean difference (95% CI) | p value* | |
|---|---|---|---|---|
| V′maxFRC=maximum flow at functional residual capacity. *Independent t test. | ||||
| Cough more than other children | n=8 | n=61 | ||
| V′maxFRC | 68.3 (36.7) | 106.0 (55.1) | 37.7 (–2.4 to 77.8) | 0.06 |
| Size adjusted V′maxFRC | 1.21 (0.65) | 1.88 (0.97) | 0.67 (–0.03 to 1.38) | 0.06 |
| Cough usually with colds | n=52 | n=17 | ||
| V′maxFRC | 93.4 (50.5) | 126.8 (59.9) | 33.3 (3.82 to 62.8) | 0.03 |
| Size adjusted V′maxFRC | 1.67 (0.90) | 2.23 (1.02) | 0.56 (0.04 to 1.08) | 0.03 |
| Cough apart from colds | n=11 | n=58 | ||
| V′maxFRC | 65.3 (36.2) | 108.5 (54.8) | 43.1 (8.7 to 77.6) | 0.015 |
| Size adjusted V′maxFRC | 1.16 (0.64) | 1.93 (0.96) | 0.77 (0.17 to 1.37) | 0.013 |
| Cough mainly at night | n=32 | n=37 | ||
| V′maxFRC | 89.5 (44.5) | 112.2 (60.4) | 22.7 (–2.6 to 48.0) | 0.08 |
| Size adjusted V′maxFRC | 1.59 (0.80) | 1.99 (1.05) | 0.40 (–0.05 to 0.85) | 0.08 |
| Cough with excitement | n=8 | n=61 | ||
| V′maxFRC | 56.8 (25.5) | 107.5 (54.6) | 50.7 (26.7 to 74.8) | <0.001 |
| Size adjusted V′maxFRC | 1.03 (0.46) | 1.91 (0.96) | 0.87 (0.44 to 1.31) | 0.001 |