Table 1.

Quality assessment of data.

Data sources	Health indicator	Quality assessment
		Coverage	Accuracy
Vital registration	Age-sex-specific mortality	Overall 95% completeness of all death events, less completed among perinatal, neonatal, and the oldest age group so that death events are not registered	NA
Vital registration	Cause-specific mortality	Same as above	Up to 40% ill-defined cause, in particular where deaths take place at home
Hospital data	Mortality	35% of total deaths took place in hospitals	Still 20% ill-defined cause
	Incidence and prevalence of disease	NA	Quality control process
Disease notification	Incidence, mortality, case fatality	In principle it covers all events.	Suspected and confirmedcases are reported;it was used for diseasesurveillance and outbreakcontrol purposes
		Public health personnel have a duty to notify their local authority of suspected cases of certain infectious diseases.
		Often public non-MOPH and private hospitals do not comply with notification of diseases to the MOPH
Household health survey	Incidence, prevalence of selected diseases	Large household survey is a national representative sample	Recall bias and laypeople report

Note: NA: not applicable.