Mental state: 1d. Specific: various aspects – mean endpoint score (various subscales) (skewed data)
Study	Intervention	Mean	SD	N
Aggressiveness (Colorado Client Assessment Record (CCAR), high = greater severity) – medium term
Reynolds 2004	Peer support	1.20	0.63	8
Reynolds 2004	Standard care	1.10	0.32	11
Anxiety (CCAR, high = greater severity) – medium term
Reynolds 2004	Peer support	3.33	1.73	8
Reynolds 2004	Standard care	3.00	1.88	11
Attention problem (CCAR, high = greater severity) – medium term
Reynolds 2004	Peer support	1.89	1.62	8
Reynolds 2004	Standard care	2.50	1.84	11
Behavioural and cognitive symptom (Instrument to Measure Self‐Management (IMSM), high = greater frequency) – medium term
Goldberg 2013	Peer support	1.9	1.0	28
Goldberg 2013	Standard care	1.8	1.2	29
Cognitive problem (CCAR, high = greater severity) – medium term
Reynolds 2004	Peer support	1.89	1.45	8
Reynolds 2004	Standard care	1.80	1.32	11
Depression (Behaviour and Symptom Identification Scale (BASIS‐24), high= greater severity) – medium term
Eisen 2012	peer support	1.3	0.9	74
Eisen 2012	standard care	1.21	0.87	84
Depression (CCAR, high = greater severity) – medium term
Reynolds 2004	peer support	2.44	1.42	8
Reynolds 2004	standard care	3.4	1.43	11
Emotional lability (BASIS‐24, high = greater severity) – medium term
Eisen 2012	Peer support	1.32	1.06	74
Eisen 2012	Standard care	1.49	0.95	84
Emotional withdrawal (CCAR, high = greater severity) – medium term
Reynolds 2004	Peer support	2.56	1.94	8
Reynolds 2004	Standard care	2.20	1.75	11
Family problems (CCAR, high = greater severity) – medium term
Reynolds 2004	Peer support	1.67	1.41	8
Reynolds 2004	Standard care	1.40	0.97	11
Hyperaffect (CCAR, high = greater severity) – medium term
Reynolds 2004	Peer support	1.56	1.33	8
Reynolds 2004	Standard care	1.40	0.70	11
Interpersonal relationship (BASIS‐24, high = greater severity) –medium term
Eisen 2012	peer support	1.28	0.76	74
Eisen 2012	standard care	1.26	0.85	84
Interpersonal problems (CCAR, high = greater severity) – medium term
Reynolds 2004	peer support	2.78	1.3	8
Reynolds 2004	standard care	2.5	1.43	11
Loneliness (Loneliness Scale, high = greater loneliness) – medium term
Van Gestel‐Timmermans 2012	Peer support	5.45	3.87	125
Van Gestel‐Timmermans 2012	Standard care	6.49	3.68	102
Physical activity (IMSM, high = greater frequency) – medium term
Goldberg 2013	Peer support	3.2	1.2	28
Goldberg 2013	Standard care	2.2	1.4	29
Psychotic symptoms (BASIS‐24, high = greater severity) – medium term
Eisen 2012	peer support	0.58	0.87	74
Eisen 2012	standard care	0.66	0.87	84
Positive symptoms (BSI, high = greater severity) – medium term
Cook 2012b	peer support	19.52	13.74	224
Cook 2012b	standard care	21.38	13.68	234
Positive symptom (BSI, high = greater severity) – long term
Cook 2012b	peer support	12.2	outlier	220
Cook 2012b	standard care	12.65	15	228
Resistiveness (CCAR, high = greater severity) – medium term
Reynolds 2004	Peer support	1.67	1.41	8
Reynolds 2004	Standard care	1.40	0.84	11
Self‐harm (BASIS‐24, high = greater severity) ‐– medium term
Eisen 2012	Peer support	0.18	0.50	74
Eisen 2012	Standard care	0.18	0.46	84
Suicide feelings (CCAR, high = greater severity) – medium term
Reynolds 2004	Peer support	2.22	2.44	8
Reynolds 2004	Standard care	1.70	1.06	11
Thought process difficulties (CCAR, high = greater severity) – medium term
Reynolds 2004	peer support	2.56	2	8
Reynolds 2004	standard care	2.1	1.91	11