Table 5.

Change in 6-Min Walk Distance per Additional Percentage of Sleep Efficiency in Heavy Smokers^a

Cigarettes per Day	No. (%)	Estimated 6MWT Change (m)
10	31 (14.8)	0.84
15	8 (3.8)	1.73
20	22 (10.5)	2.62
25	3 (1.4)	3.51
30	1 (0.5)	4.39
35	0 (0.0)	5.28
40	1 (0.5)	6.17

See Table 3 legend for expansion of abbreviation.

^aBased on model slope estimates and the assumption that all other covariates are held constant.