Nutrition Environment Measures Survey

They are companion instruments for different settings. NEMS-S audits retail food stores, scoring the availability, price and quality of a list of healthier indicator foods (such as wholemeal bread, low-fat milk and fresh produce) against their standard versions. NEMS-R audits restaurants, scoring the availability of healthier entrées and preparation methods, facilitators and barriers to healthy eating (like menu cues or portion options), and pricing. Both were developed and published together by Glanz, Saelens, Sallis and Frank in 2007 and share the same logic of direct, standardised observation; researchers choose one or both depending on which outlets shape the environment they study.

Because availability alone overstates access. A store may technically stock low-fat milk or fresh fruit, but if the healthier option costs much more than the standard one, or if the produce is wilted and unappealing, people are less likely to buy it. NEMS therefore compares the price of healthier versus standard versions of the same product and rates the quality of perishables. Capturing these three dimensions together gives a far more realistic picture of whether healthy eating is genuinely feasible in a given outlet than a simple presence/absence count.

Through trained raters and explicit reliability testing. Auditors are trained on the protocol, and pairs of raters independently audit the same outlets so inter-rater agreement can be quantified with kappa statistics and intraclass correlation coefficients; test-retest checks confirm stability over short intervals. The original development studies reported high agreement, and replicating these checks — with retraining when agreement is low — is standard before scores are used. This discipline is what allows a NEMS score to be interpreted as a property of the environment rather than of the observer.