Table 6.
Quality criteria
|
|||||
---|---|---|---|---|---|
Organisational characteristics | Recruitment | Completeness of data | Explicit definitions | Independent outcomes | Validation |
National coverage (v regional) | 0.98 | 0.77 | 1.15 | 0.80 | 1.88 |
Continuous or periodic data collection (v one off) | 1.16 | 1.72 | 0.91 | 1.25 | 1.47 |
Patients informed of data collection (v not informed) | 1.30 | 1.79† | 0.83 | 1.09 | 1.24 |
Approval by professional body (v none) | 0.82 | 1.08 | 1.04 | 1.03 | 1.64 |
Linkage to other databases (v none) | 1.30 | 0.80 | 1.24 | 1.16 | 1.75 |
Membership of management team (v none): | |||||
Epidemiologist or statistician | 1.58 | 0.85 | 1.13 | 0.86 | 1.87 |
General manager | 1.31 | 0.93 | 1.04 | 1.08 | 0.96 |
Layperson | 0.97 | 0.74 | 1.02 | 0.79 | 0.53 |
Definitions of good quality. Recruitment: ≥90% of eligible population recruited to database. Completeness of data: 80% of variables 95% complete. Explicit definitions: 50% of variables have explicit written definition. Independent outcomes: independent observer blinded to intervention or objective outcome. Validation: range and consistency checks.
P=0.016.