Table 2 Data quality, internal validity, Legionnaires’ disease cases notified in MSIS, 2008 to 2017, Norway
From: Evaluation of the national surveillance of Legionnaires' disease in Norway, 2008-2017
Variable | Criteria for valid value | Valid observations | ||
|---|---|---|---|---|
n | % | 95% CI | ||
Dates | ||||
Date illness onset | < sample date and < date of reporting | 404 | 92.2 | 89.3;94.6 |
Date sample taken | > date of illness onset and < = date of reporting | 404 | 92.2 | 89.3;94.6 |
Date of reporting | > date of illness onset and > = sample date | 433 | 98.9 | 97.3;99.6 |
Diagnostic test and diagnosis | ||||
Analysed specimen | BAL, blood, expectorate, induced sputum, airway secretions, urine, biopsy, tissue sample | 427 | 97.5 | 95.6;98.7 |
Test method and analyses specimen match | Material urine if method antigen test, and not antigen test if not urine | 435 | 99.3 | 98.0;99.9 |
Reported by | At least one of reporting institution, person, hospital stated | 432 | 98.6 | 97.0;99.5 |
Name of laboratory that analysed sample | Not ‘other’, ‘unknown’ or empty field | 393 | 89.7 | 86.5;92.4 |