Table 1 Proportions of data type being investigated, reference standards used to assess quality, and commonest measures of quality. Figures are numbers (percentage) of studies


 Measuring data quality (n=37)
Scoping data quality (n=15)
Data type:


Diagnostic or symptom state data
34 (92)
14 (93)
Management data
16 (43)
4 (27)
Wider aspect of care
10 (43)
3 (20)
Reference standard


Video, direct examination:
1 (2)
1 (7)
Surveys
7 (19)
3 (20)
Routine data
24 (65)
12 (80)
National statistics, rates
18 (49)
8 (53)
Quality measures used:


Rate comparison
27 (73)
10 (67)
Sensitivity
20 (54)
7 (47)
Positive predictive value
7 (19)
8 (53)
Specificity
3 (8)
1 (7)