Table 1. Overview of Experimental Attributes Across Studies.
| Experimental design | No. of studies |
| Pre- & post-design | 30 |
| Retrospective | 16 |
| Control group | 24 |
| Longitudinal | 5 |
| Rating sources | No. of studies |
| Self-report | 40 |
| Other-report | 24 |
| Multisource | 12 |
| Objective | 3 |
| Outcome examined | No. of studies |
| Individual | 32 |
| Organisation | 18 |
| Mechanism | No. of studies |
| Coachee | 12 |
| Coach | 12 |
| Coachee-Coach relationship | 9 |
| Participants across studies | Range (min—max) |
| Coachees | 1–638 |
| Coaches | 1–96 |
| Control group | 6–1842 |
| Other-raters | 28–242 |
| Coaching sessions | 1–12 |