The differences in patients' HRQoL levels among these studies might be either due to inconsistency in patients' characteristics, differences in cultures and mode of data collection related to HRQoL, or attributable to variation in the NTP's performance.
These procedures included preparatory meetings, site visits, close monitoring of data collection and data entry, concurrent query management, inconsistency checks, double data collection for selected medical charts, and the use of a detailed manual of operation.
After completion of data collection, the data were reviewed for inconsistencies and where necessary, corrections were made after contacting the respondents before data entry and analysis were done.
We cannot explain this inconsistency but it could be due to the small sample size or the timing of data collection.
High quality data and reliable information was guaranteed by several steps: preparatory meetings, development of detailed manuals of operation, monitoring technical site visits to the centers, close monitoring of data collection and data entry, concurrent query management, checking for logical inconsistencies, and correction of database.
Cross checking of data collection forms will be performed in the field by the data collectors for inconsistency and missing data.
The triangulation efforts tested for consistency of results, noting that inconsistencies do not necessarily weaken the credibility of results, but reflect the sensitivity of different types of data collection methods.
All aspects of data collection and storage will be carefully monitored to ensure rapid detection of errors, inconsistencies or other problems.
There's a lot of data collection to be done".
Multiple methods of data collection were adopted.
