2006			P-value	2010			P-value	2014			P-value
	Self-employed		Workers in standard employment		Self-employed		Workers in standard employment		Self-employed		Workers in standard employment
	Small business	Middle to large business			Small business	Middle to large business			Small business	Middle to large business
Monthly income (US$), n (%):
< US$ 1000	450 (21.58)	13 (5.35)	748 (14.7)	<0.0001	250 (11.88)	1 (0.76)	425 (9.7)	<0.0001	391 (4.68)	2 (0.34)	581 (3.09)	<0.0001
US$ 1000-US$ 1999	832 (39.9)	19 (7.82)	2201 (43.26)		627 (29.8)	6 (4.55)	1688 (38.51)		2118 (25.37)	21 (3.61)	6186 (32.89)
US$ 2000-2999	512 (24.56)	74 (30.45)	1369 (26.91)		659 (31.32)	15 (11.36)	1269 (28.95)		2699 (32.32)	60 (10.33)	6389 (32.89)
≥US$ 3000	291 (13.96)	137(56.38)	770(15.13)		568(27)	110(83.33)	1001(22.84)		3142(37.63)	498(85.71)	5653(30.05)
Education attainment, n (%):
Elementary or less	160 (7.67)	4 (1.65)	142 (2.79)	<0.0001	110 (5.23)	1 (0.76)	85 (1.94)	<0.0001	111 (1.33)	0 (0)	110 (0.58)	<0.0001
Middle to high school	1366 (65.52)	85 (34.98)	2364 (46.46)		1370 (65.11)	44 (33.33)	1987 (45.33)		5333 (63.87)	161 (27.71)	6887 (36.62)
College or more	559 (26.81)	154 (63.37)	2582 (50.75)		624 (29.66)	87 (65.91)	2311 (52.73)		2906 (34.80)	420 (72.29)	11812 (62.80)
Job classification, n (%):*
White collar	337 (16.16)	144 (59.26)	2546 (50.04)	<0.0001	385 (18.3)	87 (65.91)	2195 (50.08)	<0.0001	1223 (14.65)	317 (54.56)	10178 (54.11)	<0.0001
Blue collar	813 (38.99)	50 (20.58)	1740 (34.2)		605 (28.75)	20 (15.15)	1221 (27.86)		2194 (26.28)	110 (18.93)	4831 (25.72)
Pink collar	935(44.84)	49 (20.16)	802 (15.76)		1114 (52.95)	25 (18.94)	967 (22.06)		4933 (59.08)	154 (26.51)	3793 (20.17)