Table 1. Details of sampled provinces and enumeration areas (EAs) in each regional stratum.

Strata	Numbers of Sampled Provinces	Names of Sampled Provinces	Numbers of Sampled EAs
Bangkok	1	Bangkok	16
Central (except Bangkok)	3	Kanjanaburi, chantaburi, Patumtani	48
North	2	Chiang Mai, Petchaboon	32
Northeast	3	Nakornrajsima, Khon Kaen, Yasothorn	48
South	2	Chumporn, Songkra	32
Total	11		176