Table 1.

Baseline characteristics in the care as usual (CAU) and the ECO intervention group

	CAU (n=89)	ECO (n=131)
Age, mean (SD)	45.5 (10.7)	43.3 (9.5)
Female, N (%)	53 (59.6)	77 (58.8)
Married/living together, N (%)	62 (69.7)	91 (69.5)
Educational level, N (%)
Low	32 (36.0)	48 (36.6)
Average	31 (34.8)	47 (35.9)
High	26 (29.2)	36 (27.5)
Country of birth: The Netherlands, N (%)	83 (93.3)	123 (93.9)
Direct medical costs, mean (SD)	645 (58)	602 (49)
Direct non-medical costs, mean (SD)	35 (2)	33 (2)
Absenteeism, mean (SD)	2850 (146)	3078 (125)
Presenteeism, mean (SD)	34 (16)	20 (14)
Costs in the domestic realm, mean (SD)	143 (26)	133 (20)
Medication, mean (SD)	8 (2)	12 (3)
Total costs, mean (SD)	3716 (154)	3879 (141)
Quality of life, mean (SD)	0.57 (0.027)	0.54 (0.024)

ECO, E-health module embedded in Collaborative Occupational healthcare.