Table 2. Primary outcomes with a priori criteria for success and results.
| Primary outcomes | Criteria for success | Result |
| The process of recruitment | ||
| Eligible for randomisation | >75% | 69/89 (78%) |
| Willingness to be randomised | >90% | 60/65 (92%) |
| Recruitment rate (participants per month) | 3.75 | 3.37 |
| Appointment adherence | ||
| Scheduled appointments carried out | ||
| Training | 90% | 38/42 (90%) |
| Shock wave therapy | 90% | 60/60 (100%) |
| Intervention compliance, acceptability and comprehensiveness | ||
| Participants performed ≥30/36 training sessions within 12 weeks | – | 6/19 (32%) |
| Participants within each intervention group rating ‘acceptable’ (≥+3) at baseline | ||
| Information and advice | ≥10/20 | 16/20 (80%) |
| Training | ≥10/20 | 19/20 (95%) |
| Shock wave therapy | ≥10/20 | 20/20 (100%) |
| Participants within each intervention group rating ‘acceptable’ (≥+3) at 3 months follow-up | ||
| Information and advice | ≥10/20 | 11/18 (61%) |
| Training | ≥10/20 | 13/19 (68%) |
| Shock wave therapy | ≥10/20 | 20/20 (100%) |
| Participants within each intervention group rating ‘understandable’ (≥+3) at baseline | ||
| Information and advice | ≥10/20 | 18/20 (90%) |
| Training | ≥10/20 | 20/20 (100%) |
| Shock wave therapy | ≥10/20 | 20/20 (100%) |
| Participants within each intervention group rating ‘understandable’ (≥+3) at 3 months follow-up | ||
| Information and advice | ≥10/20 | 14/18 (78%) |
| Training | ≥10/20 | 18/19 (95%) |
| Shock wave therapy | ≥10/20 | 20/20 (100%) |
| Outcome measures | ||
| Retention rate at 3 months | >75% | 58/60 (97%) |
| Retention rate at 6 months | >75% | 41/60 (68%) |
| Completeness of data at baseline | ||
| Patient-rated tennis elbow evaluation | >75% | 60/60 (100%) |
| Quick-DASH | >75% | 60/60 (100%) |
| EQ-5D-5L | >75% | 60/60 (100%) |
| Pain-free grip strength | >75% | 60/60 (100%) |
| Completeness of data at 3 months | ||
| Patient-rated tennis elbow evaluation | >75% | 57/58 (98%) |
| Quick-DASH | >75% | 58/58 (100%) |
| EQ-5D-5L | >75% | 58/58 (100%) |
| Pain-free grip strength | >75% | 58/58 (100%) |
| Completeness of data at 6 months | ||
| Patient-rated tennis elbow evaluation | >75% | 41/41 (100%) |
| Quick-DASH | >75% | 41/41 (100%) |
| EQ-5D-5L | >75% | 41/41 (100%) |
EQ-5D-5LEuroQol-5 Dimension-5 levelsQuick DASHQuick Disability of the Arm, Shoulder and Hand