3 While snoring itself does not always indicate sleep apnea, for smokers it may be an early warning sign
Hackendahl, N., Sereda, C., & Volmer, P
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Non-parametric statistical tests for repeated measures ordinal data (Friedman test) were conducted to compare the four condition (6F, 18F, 6A, 18A) (3 degrees of freedom) to detect whether the number of people for whom an increase or decrease was shown between conditions was statistically significant for aerosol yield, nicotine, formaldehyde and acetaldehyde (as potential carcinogens)