BMC Medical Informatics and Decision Making

Table 5 Contingency table for the comparison between WHS 2013 and 2014 data and the same individuals in GP data. Nearest status code

From: Development of an algorithm for determining smoking status and behaviour over the life course from UK electronic primary care records

	WHS				Totals
GP	Missing data	smoker	Ex-smoker	Never smoker	Totals
Missing data	<5	100	124	203	423
Smoker	10	985	194	20	1209
Ex-smoker	25	133	1323	143	1624
Never smoker	32	83	540	2916	3571
Totals	72	1301	2181	3282	6836

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ISSN: 1472-6947

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