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Low immunisation rates: fact or fiction?
1North West Thames Regional Health Authority, London.
Insights
A 1987 study found only 61% of two-year-olds in Riverside received diphtheria immunization. Record inaccuracies meant many children were presumed unvaccinated, highlighting data quality issues in the Child Health System.
Area of Science:
- Public Health
- Immunization Programs
- Health Informatics
Background:
- Primary immunization uptake for diphtheria in 1987 was 61% for two-year-olds in Riverside.
- A significant number of children were recorded as not fully immunized.
Purpose of the Study:
- To retrospectively analyze immunization records of children aged two in Riverside.
- To identify discrepancies and reasons for incomplete immunization data within the Child Health System.
Main Methods:
- Retrospective survey of immunization records for children aged two on the Child Health System.
- Categorization of children initially recorded as not fully immunized.
Main Results:
- Of children presumed not fully immunized, 46% were actually immunized.
- 18.1% had moved, 15.6% were untraceable, 13.6% lacked immunization references, and only 2.5% were definitively not immunized.
- Significant omissions and inaccuracies were found in the Child Health System data.
Conclusions:
- The Child Health System data quality is compromised by numerous omissions.
- Recommendations are proposed to improve the accuracy and completeness of immunization data.
- Addressing data quality is crucial for effective public health monitoring and intervention.
Abstract:
The uptake rate for primary immunisation against diphtheria in 1987 in the east part of Riverside District Health Authority was 61% for children aged two. A retrospective survey was undertaken of the immunisation records of all children aged two recorded on the Child Health System as not fully immunised: 46% had been immunised; 18.1% had moved out of the district; 15.6% of the children could not be traced; in 13.6% of records, there was no reference to immunisation; and only 2.5% of children were definitely not immunised. Large numbers of omissions were found in the data held on the Child Health System. The reasons for this are discussed and recommendations made for improving the quality of the data held.