Table 1.
Search strategy
| 1. | befriend$. ti, ab. |
| 2. | (home adj visit$). ti, ab. |
| 3. | (visit$ adj program$). ti, ab. |
| 4. | mentor$3. ti, ab, kw. |
| 5. | Mentors/ |
| 6. | 4 not 5 |
| 7. | psychosocial. ti, ab. |
| 8. | network$3. ti, ab, kw. |
| 9. | prevent$3. ti, ab. |
| 10. | promot$. ti, ab. |
| 11. | support. ti, ab, kw. |
| 12. | self-help. ti, ab, kw. |
| 13. | (self adj help). ti, ab, kw. |
| 14. | (social$2 adj activ$5). ti, ab. |
| 15. | Health Promotion/ |
| 16. | (health adj promotion). ti, ab, kw. |
| 17. | (health adj status). ti, ab, kw. |
| 18. | exp community networks/ |
| 19. | (social$2 adj participat$3). ti, ab. |
| 20. | (social$2 adj integrat$3). ti, ab. |
| 21. | friendship. ti, ab, kw. |
| 22. | (quality adj2 life). ti, ab. |
| 23. | (well adj being). ti, ab, kw. |
| 24. | wellbeing. ti, ab, kw. |
| 25. | (self adj esteem). ti, ab. |
| 26. | exp Self Esteem/ |
| 27. | (creative adj activ$5). ti, ab, kw. |
| 28. | exercise. ti, ab, kw. |
| 29. | (physical adj activ$5). ti, ab, kw. |
| 30. | peer. ti, ab, kw. |
| 31. | socio-medical. ti, ab, kw. |
| 32. | 1 or 2 or 3 or 6 or 7 or 8 or 9 or 10 or 11 or 12 or 13 or 14 or 15 or 16 or 17 or 18 or 19 or 20 or 21 or 22 or 23 or 24 or 25 or 26 or 27 or 28 or 29 or 30 or 31 |
| 33. | Middle Aged/ |
| 34. | Aged/ |
| 35. | "Aged, 80 and over"/ |
| 36. | geriatric. ti, ab. |
| 37. | elder$2. ti, ab, kw. |
| 38. | older$. ti, ab, kw. |
| 39. | senior$. ti, ab. |
| 40. | (ageing or aging). ti, ab, kw. |
| 41. | (old$2 adj age$3). ti, ab. |
| 42. | aged. ti, ab. |
| 43. | retire$4. ti, ab. |
| 44. | 33 or 34 or 35 or 36 or 37 or 38 or 39 or 40 or 41 or 42 or 43 |
| 45. | (social$2 adj4 isolat$3). ti, ab, kw. |
| 46. | (isolated adj (elder$ or old$)). ti, ab. |
| 47. | (social$2 adj alienat$3). ti, ab. |
| 48. | (social$2 adj exclu$). ti, ab, kw. |
| 49. | (social adj contact$). ti, ab. |
| 50. | (social adj environment). ti, ab, kw. |
| 51. | lonel$5. ti, ab, kw. |
| 52. | loss. kw. |
| 53. | bereave$4. kw. |
| 54. | Loneliness/ |
| 55. | Social Isolation/ |
| 56. | Social Alienation/ |
| 57. | Social Distance/ |
| 58. | 45 or 46 or 47 or 48 or 49 or 50 or 51 or 52 or 53 or 54 or 55 or 56 or 57 |
| 59. | Intervention Studies/ |
| 60. | intervention. ti, ab. |
| 61. | Program Evaluation/ |
| 62. | program$2 evaluation"tabcaption". ti, ab. |
| 63. | 59 or 60 or 61 or 62 |
| 64. | exp randomized controlled trials/ |
| 65. | "randomized controlled trial". pt. |
| 66. | "controlled clinical trial". pt. |
| 67. | (random$ or placebo$). ti, ab, sh. |
| 68. | ((singl$ or double$ or triple$ or treble$) and (blind$ or mask$)). tw, sh. |
| 69. | (retraction of publication or retracted publication). pt. |
| 70. | 64 or 65 or 66 or 67 or 68 or 69 |
| 71. | (animals not humans). sh. |
| 72. | 70 not 71 |
| 73. | exp case-control studies/ |
| 74. | controlled clinical trial/ |
| 75. | exp clinical trial/ |
| 76. | control$3. ti, ab. |
| 77. | (quasi adj experiment$2). ti, ab. |
| 78. | match$3. ti, ab. |
| 79. | trial. ti, ab. |
| 80. | (controlled adj5 trial). ti, ab, kw. |
| 81. | (randomi?ed adj controlled adj trial). ti, ab. |
| 82. | 63 or 72 or 73 or 74 or 75 or 76 or 77 or 78 or 79 or 80 or 81 |
| 83. | 32 and 44 and 58 and 82 |