Table 6

Association of maximum exercise capacity and SHS exposure

Variable	VO_2max (mL/min) r²=0.39
Variable	PE±SEM	P values
Cabin SHS exposure (years)	−7±4	0.040
Childhood home SHS exposure	−6±63	0.930
Adult home SHS exposure	−16±66	0.805
Non-airline occupational SHS exposure	91±60	0.134
Other SHS exposure*	−29±67	0.661
Age	−10±4	0.008
Height	9±6	0.134
Weight	1±4	0.722
Sex	−448±144	0.002

The association of maximum exercise capacity (VO_2max) with SHS was estimated using the regression analyses with adjustment for age, sex, height and weight on the regression model: Work=β₀+β₁(age)+β₂(height)+β₃(weight)+β₄(sex)+β₅(cabin SHS)+β₆(non-cabin SHS). SHS exposures were included as dichotomous variable except for cabin SHS exposure.
*Other SHS exposure was defined as non-aircraft cabin SHS exposure outside the work or home environment such as in recreational public places. n=127. Significant p-values are shown in bold.
PE±SEM, parameter estimate±SEM; r², model fit; SHS, secondhand tobacco smoke; VO_2max, maximum oxygen uptake.