BMC Medical Informatics and Decision Making

Table 4 Contingency table for the comparison between WHS 2013 and 2014 data and the same individuals in GP data. Full algorithm but without checking for previous smoking status

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	99	120	199	423
Smoker	16	1017	452	236	1721
Ex-smoker	22	112	1108	126	1368
Never smoker	29	73	501	2721	3324
Totals	72	1301	2181	3282	6836

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ISSN: 1472-6947

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