Table III.
Reporting quality of methodology of included studies.
| Methods | Frequency | % |
|---|---|---|
| Describes the data source | ||
| Yes | 16/19 | 84.2 |
| Incomplete | 2/19 | 10.5 |
| Unclear | 1/19 | 5.3 |
| Describes type of records (inpatient, outpatient, linked records) | ||
| Yes | 18/19 | 94.7 |
| Unclear | 1/19 | 5.3 |
| Describes setting and locations where data were collected | ||
| Yes | 18/19 | 94.7 |
| Incomplete | 1/19 | 5.3 |
| Reports a priori sample size | ||
| Yes | 1/19 | 5.3 |
| Provides statistical justification for the sample size | ||
| Yes | 0/19 | 0.0 |
| Describe recruitment procedure of validation cohort (from a database, based on diagnostic codes) | ||
| Yes | 17/19 | 89.5 |
| Unclear | 2/19 | 10.5 |
| Describe patient sampling (Random, consecutive, all) | ||
| Random sampling | 1/19 | 5.3 |
| All | 14/19 | 73.7 |
| Unclear | 2/19 | 10.5 |
| Incomplete | 2/19 | 10.5 |
| Describe how participants were chosen for data collection and analysis | ||
| Yes | 15/19 | 78.9 |
| Unclear | 2/19 | 10.5 |
| Describes inclusion/exclusion criteria | ||
| Yes | 14/19 | 73.7 |
| Incomplete | 1/19 | 5.3 |
| Describes who identified patients (for patients identified from medical records) | ||
| Yes | 1/19 | 5.3 |
| Incomplete | 1/19 | 5.3 |
| Describes who collected data | ||
| Yes | 3/19 | 15.8 |
| Describes use of a priori data collection form | ||
| Yes | 13/19 | 68.4 |
| Unclear | 1/19 | 5.3 |
| Use of a split sample or an independent sample (revalidation using a separate cohort) | ||
| Yes | 1/19 | 5.3 |
| Describes the reference standard | ||
| Yes | 13/17 | 76.5 |
| Reports the number of persons reading the reference standard | ||
| Yes | 2/17 | 11.8 |
| Describes the training or expertise of persons reading reference standard | ||
| Yes | 1/17 | 5.9 |
| Readers of the reference standard were blinded to the results of the classification by routinely collected data for that patient (reference standard: medical records) | ||
| Yes | 1/17 | 5.9 |
| Reports a measure of concordance if >1 persons reading the reference standard | ||
| Yes | 0/17 | 0.0 |
| Describes the linkage procedure, if done (probabilistic/deterministic) | ||
| Yes | 8/15 | 50.0 |
| Incomplete | 6/15 | 37.5 |
| Describes the methods of linkage quality evaluation | ||
| Yes | 7/15 | 46.7 |
| Incomplete | 2/15 | 13.3 |
| Describes explicit methods for calculating or comparing measures of accuracy and statistical methods used to quantify uncertainty | ||
| Yes | 13/19 | 68.4 |