Rrs | Coefficient | SE | 95% CI | p-value | r2 |
ln (R4–16) | 0.21 | ||||
Age yrs | −0.003 | 0.002 | −0.007–0.002 | 0.226 | |
Sex | −0.188 | 0.044 | −0.273– −0.101 | <0.001 | |
Height m | −0.653 | 0.224 | −1.095– −0.211 | 0.004 | |
Weight kg | 0.007 | 0.001 | 0.004–0.009 | <0.001 | |
Constant | 0.491 | 0.434 | −1.347–0.364 | 0.259 | |
ln (RM) | 0.23 | ||||
Age yrs | −0.004 | 0.002 | −0.008– −0.000 | 0.034 | |
Sex | −0.203 | 0.040 | −0.281– −0.124 | <0.001 | |
Height m | 0.519 | 0.205 | −0.923– −0.115 | 0.012 | |
Weight kg | 0.005 | 0.001 | 0.003–0.008 | <0.001 | |
Constant | −0.467 | 0.397 | −1.250–0.315 | 0.240 | |
1/FN | 0.20 | ||||
Age yrs | 0.000 | 0.000 | −0.001– −0.000 | 0.011 | |
Sex | 0.011 | 0.004 | 0.003–0.018 | 0.04 | |
Height m | 0.062 | 0.019 | 0.025–0.098 | 0.001 | |
Weight kg | −0.001 | 0.000 | −0.001– −0.000 | <0.001 | |
Constant | 0.067 | 0.036 | −0.004–0.139 | 0.064 |
Zrs variables were normalised for multiple regression analysis (ln transformation for mean resistance between 4–30 Hz (RM) and mean resistance between 4–16 Hz (R4–16), and 1/FN for resonant frequency). Rrs: resistance; se: standard error; 95% CI: 95% confidence interval; r2: variability of Zrs variables explained by age, sex, height or weight. See Appendix for equations. n = 223; male = 1; female = 0.