From: Non-specific psychological distress, smoking status and smoking cessation: United States National Health Interview Survey 2005
%
95% CI
K6 level of non-specific psychological distress
0 - 2
7.1
(6.1 - 8.1)
3 - 7
25.3
(23.1 - 27.5)
8 - 12
52.9
(46.9 - 58.9)
13 - 24
80.0
(73.7 - 86.3)