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
Working time per week, mean (SE)
60 (22.28)	50.85 (15.16)	48.3 (12.48)	<0.0001	58.5 (19.33)	51.2 (13.17)	47.05 (11.05)	<0.0001	56.74 (15.89)	50.26 (12.59)	45.39 (9.47)	<0.0001
Over time working (≥52 hours per week), number (%)
1273 (61.06)	84 (34.57)	1430 (28.11)	<0.0001	1352 (64.26)	46 (34.85)	1056 (24.09)	<0.0001	5294 (63.40)	201 (34.60)	3284 (17.46)	<0.0001
Work on weekend per month, mean (SE):
4.92(2.7)	3.47(2.56)	2.88(2.46)	<0.0001	4.53(2.69)	3.39(2.84)`	2.36(2.44)	<0.0001	4.45(2.51)	3.25(2.79)	1.84(2.33)	<0.0001
Presenteeism, n (%):
-	-	-		503 (23.91)	21 (15.91)	807 (18.41)	<0.0001	2569 (30.77)	136 (23.41)	4532 (24.09)	<0.0001