The results will also be reported for major participant subgroups defined by sex, age and area of residence with evidence for differences between subgroups tested. Estimates of sodium consumption will also be made directly from the dietary survey data and compared with those obtained from the 24 h urine samples. Surveys of packaged and restaurant

foods The dietary intake data collected during kinase inhibitor the population survey will provide direct quantitative insight into the foods consumed by the population. To determine the contribution of salt from each food source requires additional information about the composition of the foods eaten. For fresh products, this can be obtained from food composition tables,26 and there are also some existing data about the composition of recipes for foods eaten at home or at traditional street hawker-type food service outlets.27 However, for packaged foods and chain restaurant products, there are no databases that systematically record the composition of the many different items now available. Retail outlets to be surveyed: Using information gleaned from the stakeholder analysis and the dietary survey, supplemented by desk research, the range of sales outlets from which the population obtains

packaged foods and chain restaurant foods will be identified. These outlets are anticipated to include large supermarkets, smaller shops and corner stores as well as a range of local and international chain restaurants. Food products to be included: For each outlet identified, systematic surveys will

be conducted to document the range of products sold and the salt content of each item (table 1). This will be done using Internet searches (mainly to seek data about chain restaurants) and by undertaking in-store surveys of food packaging (mainly to seek data about packaged foods). Where data are not available for larger corporations, we will make written requests in an attempt to access the data. The survey processes will be based on those previously detailed.28 29 Table 1 Main data items collected for the population survey Process for in-store data collection: Permission to collect data from larger stores will be sought Anacetrapib by letter, email or telephone to head offices while smaller stores will be visited in person. Once permission is obtained, data collection comprises the systematic recording of every packaged food item in the store using a smartphone application to record the barcode and take photographs of the front of the pack, the nutrition information panel and the ingredients list. The photos are uploaded to a central database and the data (table 2) are entered and the products categorised into about 600 different subgroups. For fast-food chains, in-store nutrition data will be sought from pamphlets, tray liners, food packaging or other sources, as might be available.