National Institute of Public Health, University of Southern Denmark, Øster Farimagsgade 5A, Copenhagen K, Denmark.
Public Health Nutr. 2012 Jul;15(7):1228-31. doi: 10.1017/S1368980012000845. Epub 2012 Mar 22.
We examined the quality of food outlet addresses provided by secondary sources and determined whether they could be physically located in the field.
Addresses of food outlets in fourteen school districts in the northern part of Copenhagen were obtained from multiple business locators. We geocoded 202 addresses using a geographic information system and cross-referenced the sources against each other using a validation grid. Physical presence was determined via street survey. We applied gamma statistics and calculated positive predictive value, sensitivity and percentage agreement to assess the overall correspondence between our test of physical presence and each source of secondary information.
The study took place within city boundaries of Copenhagen, Denmark.
Food outlets within fourteen school districts within Copenhagen.
Positive predictive value between field results and secondary sources indicated good to excellent correspondence (range: 0·81-0·98), comparable with other studies. Gamma coefficients indicated low to high positive correspondence (range: 0·23-0·98).
Despite moderately high correspondence between secondary sources of address information and field observation, the findings illustrate that the use of combined sources is recommended.
我们检验了次要来源提供的食品店地址的质量，并确定它们是否可以在实地找到。
从哥本哈根北部的 14 个学区获取食品店地址，这些地址来自多个商家定位器。我们使用地理信息系统对 202 个地址进行地理编码，并使用验证网格相互交叉引用这些来源。通过街道调查确定实际存在情况。我们应用伽马统计和计算阳性预测值、灵敏度和百分比一致性，以评估我们对实际存在情况的测试与每种次要信息源之间的整体一致性。
研究发生在丹麦哥本哈根市的范围内。
哥本哈根 14 个学区内的食品店。
实地调查结果与次要来源之间的阳性预测值表明存在良好到极好的一致性（范围：0.81-0.98），与其他研究相当。伽马系数表明存在低到高的正相关性（范围：0.23-0.98）。
尽管次要地址信息来源与实地观察之间存在中等程度的高度一致性，但研究结果表明，建议使用综合来源。
