cancer- 0, no cancer; 1, lung cancer
age- 1, ¡Ü65 years; 2, >65 years
sex- 1, male; 2, female
bmi-1, <24 kg/m^2; 2, ¡Ý24 kg/m^2
blood pressure- 0, non-hypertension; 1, hypertension
educational level- 1, low; 2, high
economic conditions- 1, low; 2, high
labour intensity- 1, low; 2, high
stress intensity- 1, no; 2, yes
sleep quality-1, no; 2, yes
siesta habit-1, no; 2, yes
sleep duration-1, short; 2, long
snoring-1, no; 2, yes
smoking-0, no; 1, yes
alcohol drinking-0, no; 1, yes