Table 5.

Intra-rater reliability of QLF parameters within smokers, ex-smokers, and never smokers groups

Intraclass Correlation (ICC)		95% Confidence Interval		F Test With True Value 0
		Lower bound	Upper bound	F Value	df1	df2	p value
Smokers
ΔR30	0.986	0.973	0.993	223	25	47.9	< 0.0001
ΔR120	0.993	0.987	0.997	422	25	52	< 0.0001
SOH score	0.983	0.967	0.992	178	25	50.7	< 0.0001
Ex-smokers
ΔR30	0.974	0.947	0.989	111	19	39.4	< 0.0001
ΔR120	0.955	0.909	0.98	62.2	19	38.8	< 0.0001
SOH score	0.970	0.939	0.987	96	19	39.7	< 0.0001
Never smokers
ΔR30	0.941	0.889	0.971	47.4	24	49	< 0.0001
ΔR120	0.932	0.873	0.967	43.2	24	49	< 0.0001
SOH score	0.966	0.935	0.984	83.8	24	49.6	> 0.0001

ICC estimates and their 95% confident intervals were calculated based on a mean-rating (k = 3), absolute-agreement, 2-way mixed-effects model