Variable   Frequency %
Sample size   21  
Gender Male 9 42.9
Female 12 57.1
Skin color White 19 90.5
Mestizo 2 9.5
Smoking habits Yes 3 14.3
No 18 85.7
Alcoholism Yes 4 19.0
No 17 81.0
Age (years) 66 (58-80)
Qualitative data are in (%) and quantitative in median (25th-75th percentile).
Table 1: Characteristics of the study sample.