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Table 6 Agreement between proxy 1 and proxy 2 on current smoking status case and control households

From: Identifying the determinants of premature mortality in Russia: overcoming a methodological challenge

  Case households Control households
  Proxy 1 Proxy 2 Proxy 1 Proxy 2
  N % N % N % N %
Never a smoker 15 11.5% 16 12.2% 35 19.7% 38 21.3%
No, ex-smoker 9 6.9% 10 7.6% 31 17.4% 27 15.2%
Yes, a current-smoker 107 81.7% 105 80.2% 112 62.9% 112 62.9%
Difficult to answer 0 0.0% 0 0.0% 0 0.0% 1 0.6%
Refuse to answer 0 0.0% 0 0.0% 0 0.0% 0 0.0%
No answer 0 0.0% 0 0.0% 0 0.0% 0 0.0%
Cohen's kappa coefficient 0.96 0.87