Summary of interventions characteristics for 27 trials included in the review
| Intervention n (%) | Control n (%) | ||
| Type of staff delivering intervention | General practitioners and physicians | 10 (32.3) | |
| Nurses | 15 (48.4) | ||
| Dietitian | 7 (22.6) | ||
| Others | 12 (38.7) | ||
| Mode of intervention delivery | Face-to-face sessions | 30 (96.8) | 14 (45.2) |
| Group sessions | 9 (29.0) | 1 (3.2) | |
| Written materials | 15 (48.4) | 7 (22.6) | |
| Telephone sessions | 8 (25.8) | – | |
| Unclear | – | 13 (41.9) | |
| Intervention sessions (n) | 1–4 sessions | 5 (16.1) | 9 (29.0) |
| 5–9 sessions | 11 (35.5) | 2 (6.5) | |
| 10–15 sessions | 4 (12.9) | 1 (3.2) | |
| >15 sessions | 5 (16.1) | 1 (3.2) | |
| Unclear | 6 (19.4) | 18 (58.1) | |
| BCTs (n) | 1–2 BCTs | 5 (16.1) | 14 (45.2) |
| 3–4 BCTs | 10 (32.3) | 1 (3.2) | |
| 5–6 BCTs | 12 (38.7) | – | |
| 7–9 BCTs | 3 (9.7) | – | |
| 10 BCTs | 1 (3.2) | – | |
| Unclear | – | 16 (51.6) | |
| Frequently used BCTs | Credible source (9.1) | 22 (70.9) | 6 (19.4) |
| Goal setting (behaviour) (1.1) | 19 (61.3) | 2 (6.5) | |
| Information about health consequences (5.1) | 9 (29.0) | 5 (16.1) | |
| Instruction on how to perform a behaviour (4.1) | 9 (29.0) | 1 (3.2) | |
| Action planning (1.4) | 9 (29.0) | – | |
| Self-monitoring of behaviour (2.3) | 8 (25.8) | – | |
Figures are frequencies (column percent)
BCT, behaviour change technique.