2. Healthcare visits ‐ skewed data.

Study	Interval	group	sample n	mean	SD
Drummond 1990	6 months	Consultation liaison	18	4.6	6.4
		Control	19	1.8	1.8
Katon 1999	6 weeks	Consultation liaison	114	1.6	1.8
		Control	114	1.8	1.8
	6 months	Consultation liaison	114	3.4	4.3
		Control	114	3.3	3.1
Van der Feltz 2006	6 weeks	Consultation liaison	58	44.3	59.3
		Control	23	89.2	145.1
	6 months	Consultation liaison	58	32.7	25.6
		Control	23	133.9	219.4
Worrall 1999	6 months	Consultation liaison	91	3.6	7.7
		Control	56	4.2	7.6