Table 1.

The original values of each study variable from each dataset (original variable names are given in bold type).

Dataset		2002	2007	2011
Study year		Yr	Yr	Yr
Age		A2	A2	A5
Marital status		A5	A4	A10
	Original value labels	1 = single	1 = single	1 = single
		2 = married and living together in household	2 = married and living together in household	2 = married and living together in household
		3 = married but not living together in household	3 = married but not living together in household	3 = married but not living together in household
		4 = widowed	4 = widowed	4 = widowed
		5 = divorced	5 = divorced	5 = divorced
		6 = separated	6 = separated	6 = separated
Region		REG	REG	REG
	Original value label	1 = Bangkok	1 = Bangkok	1 = Bangkok
		2 = Central (excluding Bangkok)	2 = Central (excluding Bangkok)	2 = Central (excluding Bangkok)
		3 = North	3 = North	3 = North
		4 = Northeast	4 = Northeast	4 = Northeast
		5 = South	5 = South	5 = South
Area		Area	Area	Area
	Original value label	1 = municipal	1 = municipal	1 = municipal
		2 = nonmunicipal	2 = nonmunicipal	2 = nonmunicipal
Living status		B12	Members	Members
	Original value label	1 = living alone	1 = living alone	1 = living alone
		2 = living with others	2 = living with others	2 = living with others
Working status		C1	A52	OP14
	Original value label	1 = working	1 = working	1 = working
		2 = not working	2 = not working	2 = not working
Income		C25	A80	OP41
	Original value label	0 = no income	1 = more than adequate	1 = more than adequate
		1 = inadequate	2 = adequate	2 = adequate
		2 = adequate	3 = somewhat adequate	3 = somewhat adequate
		3 = more than adequate	4 = inadequate	4 = inadequate
		9 = not known
Hypertension		G16	B22	Op96_1
Diabetes		G18	B23	Op96_2
Heart disease		G19	B24	Op96_3
Cancer		G21	B25	Op96_5
Stroke		G26/27	B26	Op96_13
	Original value labels	0 = no	0 = no	0 = no
		1 = yes	1 = yes	1 = yes
		2 = not known	2 = not known	2 = not known
Eating		G33	B28	Op104
Dressing		G34	B29	Op105
Squatting		G36	B31	Op111
Lifting 5 kg		G37	B32	Op112
Stairs: 2-3 steps		G39	B34	Op114
Bus/boat alone		G40	B35	Op115
	Original value label	0 = no, cannot do	0 = no	1 = no
		1 = yes, can do	1 = can do with aid	2 = yes, with aid
		9 = not known (considered cannot do)	2 = can do without aid	3 = yes, without aid