Table 2 Effect of exposure to second-hand smoking on ciliary beat frequency
From: Functional analysis and evaluation of respiratory cilia in healthy Chinese children
Age (years) | Family member(s) smoked | No | |||
|---|---|---|---|---|---|
Yes | |||||
N | *Mean + SD | N | *Mean + SD | P value | |
< 18 | 46 | 9.9 + 1.68 | 89 | 10.2 + 2.16 | 0.284 |
2–6 | 11 | 10.4 + 1.53 | 40 | 10.3 + 2.09 | 0.886 |
7–12 | 21 | 9.7 + 2.13 | 22 | 10.4 + 2.15 | 0.289 |
13–17 | 14 | 9.7 + 0.81 | 27 | 10.0 + 2.33 | 0.575 |
> 18 | 10 | 10.5 + 1.65 | 34 | 9.2 + 1.82 | 0.044 |