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Table 1 Summary of characteristics of included studies

From: Associations between loneliness and perceived social support and outcomes of mental health problems: a systematic review

Condition studied Predictor variable Outcomes Sample size range (median) Length of follow-upa Follow-up rate range (median) Quality score
Depression (n = 23) Perceived social support (n = 22)
Loneliness (n = 1)
Symptom severity (n = 13)
Recovery/remission (n = 7)
Functional outcomes (n = 5)
66–604 (239) Short (n = 4)
Medium (n = 14)
Long (n = 5)
60.6–100% (81.9%) **** (n = 4)
*** (n = 11)
** (n = 8)
Schizophrenia/schizoaffective disorders (n = 2) Perceived social support (n = 2) Functional outcomes (n = 2) 139–148 (143.5) Medium (n = 2) 71.9–100% (86.0%) *** (n = 1)
** (n = 1)
Bipolar disorder (n = 4) Perceived social support (n = 4) Symptom severity (n = 3)
Recovery/remission (n = 2)
Functional outcomes (n = 2)
42–173 (55.5) Short (n = 1)
Medium (n = 3)
71.1–100% (86.4%) *** (n = 2)
** (n = 2)
Anxiety disorders (n = 3) Perceived social support (n = 3) Symptom severity (n = 1)
Recovery/remission (n = 1)
Functional outcomes (n = 1)
134–1004 (1004) Short (n = 1)
Medium (n = 2)
80–87% (81.0%) **** (n = 1)
*** (n = 1)
** (n = 1)
Mixed samples with various mental health problems (n = 2) Perceived social support (n = 1)
Loneliness (n = 1)
Symptom severity (n = 1)
Functional outcomes (n = 1)
352–743 (547.5) Medium (n = 2) 79.9–84.4% (82.2%) *** (n = 1)
** (n = 1)
  1. aLength of follow-up: Short = < 1 year; Medium = 1–2 years; Long = > 2 years. ** = two criteria of MMAT met. *** = three criteria of MMAT met. **** = all criteria of MMAT met