Table 1 Naming convention for assigning unique 13-digit structure ID’s

The naming convention is as follows:

First letter/alphabet unique to the study (‘N’ in this case) followed by

Field paper sheet code which should be three characters (this was A01 in this study) followed by

Three-digit enumeration area code (for e.g., 111 for Pentagon area) followed by

Field worker identification code (3-digits, e.g., 550) followed by

Last three digits indicated serial numbering of structures, with 1 (entered as 001) being the first structure visited by the fieldworker

Finally, the unique 13-digit structure ID for the first structure visited, for example, would be NA01111550001