Table 3

 Multiple linear regression: outcome variable expiratory flow limitation (EFL%)

VariablesStandardised regression coefficientp value
n = 238, R = 0.426, R2 = 0.181; p<0.0001.
Normality test: passed (p = 0.805).
Neck circumference (cm)0.225<0.0001
FRC (% pred)−0.218<0.0001
FEF25–75 (% pred)−0.1600.009
Age (years)0.1560.011