The authors give an overview of the quality assessments in the WHO MONICA project and compare the quality of the data from Northern Sweden with other reporting units.
Methods and results: Standardized measurement procedures and routine checks were used to ensure good quality of the data. The quality has been evaluated by a scoring system. The results show that the data from Northern Sweden have good quality for all variables except total cholesterol in the initial survey. In the subsequent surveys, the quality of cholesterol data was good.
Conclusions: Great effort was put in to ensure good data quality and Northern Sweden is one of the MONICA units with very good quality of data.