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Table 1 Population distribution by level of non-specific psychological distress (K6), US National Health Interview Survey (n = 31,428) and Australian National Survey of Mental Health and Wellbeing (n = 8,841)

From: Non-specific psychological distress, smoking status and smoking cessation: United States National Health Interview Survey 2005

  Proportion of US civilian non-institutionalised adult population (NHIS) Proportion of Australian adult population (NSMHWB)
  % 95% CI % 95% CI
K6 score     
0 - 2 69.3 (68.7 - 69.9) 62.3 (60.9 - 63.8)
3 - 7 19.8 (19.2 - 20.3) 29.1 (27.6 - 30.6)
8 - 12 6.2 (5.9 - 6.5) 6.2 (5.6 - 6.8)
13 - 24 2.9 (2.7 - 3.1) 2.3 (1.9 - 2.8)
Not stated 1.8 (1.6 - 2.0) 0.0 (0.0 - 0.1)