Table 6.

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

	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