Field validation of secondary data sources: a novel measure of representativity applied to a Canadian food outlet database

Clary, Christelle M; Kestens, Yan

doi:10.1186/1479-5868-10-77

International Journal of Behavioral Nutrition and Physical Activity

Table 3 Validation statistics for the EPOI database

From: Field validation of secondary data sources: a novel measure of representativity applied to a Canadian food outlet database

				Traditionalmeasures				Relaxedmeasures
	N Total	N List	N Field	Sensitivity		Positive predictive value		Relaxed sensitivity		Relaxed positive predictive value		Representativity
	N Total	N List	N Field	Est.		Est.		Est.		Est.		Est.
Overall	549	410	484	0.545		0.644		0.655		0.773		0.777
Overall	549	410	484	0.487	0.603	0.592	0.696	0.592	0.718	0.736	0.810	0.713	0.840
Census tract characteristics
Low SES	104	73	90	0.567		0.699		0.700		0.732		0.756
Low SES	104	73	90	0.508	0.625	0.590	0.808	0.478	0.923	0.581	0.882	0.723	0.788
Medium SES	211	164	192	0.531		0.622		0.748		0.830		0.797
Medium SES	211	164	192	0.454	0.608	0.515	0.729	0.578	0.917	0.788	0.871	0.753	0.841
High SES	234	173	202	0.550		0.642		0.578		0.709		0.762
High SES	234	173	202	0.422	0.677	0.605	0.678	0.394	0.761	0.660	0.758	0.628	0.897
English	392	295	349	0.533		0.631		0.690		0.755		0.791
English	392	295	349	0.472	0.594	0.567	0.694	0.544	0.837	0.713	0.798	0.740	0.842
French	157	115	135	0.578		0.678		0.660		0.758		0.733
French	157	115	135	0.462	0.693	0.592	0.764	0.485	0.835	0.644	0.873	0.633	0.833
Categories of outlet
Convenience store	65	51	63	0.587		0.725		0.746		0.922		0.762
Convenience store	65	51	63	0.489	0.686	0.604	0.847	0.636	0.856	0.856	0.987	0.644	0.880
Chain supermarkets	4	3	4	0.750		1.000		0.750		1.000		0.750
Chain supermarkets	4	3	4	0.325	1.175	1.000	1.000	0.325	1.175	1.000	1.000	0.325	1.175
Grocery stores	38	29	33	0.485		0.552		0.485		0.552		0.545
Grocery stores	38	29	33	0.278	0.692	0.371	0.732	0.278	0.692	0.371	0.732	0.361	0.730
Bakeries	30	21	27	0.481		0.619		0.556		0.714		0.593
Bakeries	30	21	27	0.289	0.674	0.428	0.810	0.320	0.791	0.512	0.916	0.338	0.847
Specialty markets	18	13	14	0.643		0.692		0.643		0.692		0.786
Specialty markets	18	13	14	0.423	0.863	0.563	0.822	0.423	0.863	0.563	0.822	0.539	1.032
Fruit and vegetable stores	13	9	11	0.455		0.556		0.636		0.778		0.727
Fruit and vegetable stores	13	9	11	0.170	0.740	0.304	0.807	0.353	0.920	0.502	1.053	0.414	1.040
Natural food stores	17	9	16	0.438		0.778		0.438		0.778		0.500
Natural food stores	17	9	16	0.141	0.734	0.413	1.142	0.141	0.734	0.413	1.142	0.200	0.800
Megamarkets	1	1	1	1.000		1.000		1.000		1.000		1.000
Fast-food restaurants	45	32	42	0.595		0.781		0.619		0.813		0.690
Fast-food restaurants	45	32	42	0.459	0.731	0.707	0.856	0.486	0.752	0.747	0.878	0.533	0.848
Cafés	62	37	50	0.360		0.486		0.400		0.541		0.600
Cafés	62	37	50	0.249	0.471	0.339	0.634	0.297	0.503	0.421	0.660	0.453	0.747
Full-service restaurants	256	205	223	0.583		0.634		0.744		0.810		0.861
Full-service restaurants	256	205	223	0.522	0.644	0.581	0.687	0.690	0.799	0.770	0.850	0.809	0.913

Back to article page

ISSN: 1479-5868

Contact us

Submission enquiries: Access here and click Contact Us
General enquiries: info@biomedcentral.com