Criteria and scoring method for rating quality of reviewed studies
| Rating criteria | Scoring | |||
| Type of Study | 2: cohort, controlled observation or case–control | 1: observation without control | ||
| Selection method | 2: random or representative sampling | 1: non-random or non-representative sampling | ||
| Aimed to assess tour length | 1: yes | 0: no | ||
| Prospective | 1: yes | 0: no | ||
| Appropriate control group | 1: yes | 0: no | ||
| Method of health outcome assessment | 3: clinical interview/assessment | 2: self-report on standardised measures | 1: self-report on non-standardised measures | |
| Sample size | 3: >15000 | 2: 15000–5000 | 1: 5000–1000 | 0: <1000 |
| Response rate >60% | 1: yes | 0: no or NA | ||
| Adjustment for confounders of deployment length | 1: yes | 0: no | ||
| Appropriate statistical tests used | 1: yes | 0: no | ||
| Conclusions substantiated by the data | 1: yes | 0: no | ||
| Overall quality | Very high: >14 | High: 14–12 | Moderate: 11–9 | Low: <9 |