Table 2.
Characteristics of 37 studies that measured data quality
| No of publications | |
|---|---|
| Type of study: | |
| Prospective | 8 |
| Cross sectional | 6 |
| Retrospective | 23 |
| Countries involved: | |
| UK | 26 |
| Netherlands | 3 |
| UK/USA | 3 |
| UK/Canada | 1 |
| UK/Netherlands | 1 |
| Iceland | 2 |
| Nordic collaboration * | 1 |
| No of practices: | |
| Single | 3 |
| 2-10 | 11 |
| 11-100 | 13 |
| 200-750 | 4 |
| Undefined | 6 |
| Data type: | |
| Read codes | 17 |
| International classification of diseases (ICD) | 6 |
| Oxford medical information systems (OXMIS) | 5 |
| International classification of primary care (ICPC) | 3 |
| International Classification of Health Problems in Primary Care (ICHPPC) | 1 |
| Terms and textual | 2 |
| Undefined | 12 |
*
Study included data from five Nordic countries including Iceland.