Detailed activities are coded and classified into 17 major categories labelled from 01 to 17. Each category is further classified into two-tiered subcategories, each labelled with two digits. For example, time spent sleeping (t010101) is a subcategory of sleeping-related activities (0101), which is also a subcategory of personal care activities, a major category (01). Thus, each pair of digits indicates the first, second, and third tiers in order. Due to the complexity of coding daily activities, coders follow a strict flowchart to help to categorise an activity into this three-tier coding system. Detailed information about coding, categorisation, verification, and adjudication of activities is available in the ATUS User’s Guide [16].

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