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Risk factors for delayed immunization against measles, mumps, and rubella in Colorado two-year-olds
L A Miller1, R E Hoffman, A E Barón
1University of Colorado Health Sciences Center, Department of Preventive Medicine and Biometrics, Denver.
Insights
Delayed childhood immunization against measles, mumps, and rubella is linked to factors like maternal education, frequent moves, and younger parental age. Targeted interventions focusing on knowledge and specific family demographics can improve vaccination rates.
Area of Science:
- Pediatrics
- Public Health
- Epidemiology
Background:
- Childhood immunization is crucial for preventing infectious diseases.
- Delayed measles, mumps, and rubella (MMR) vaccination poses a public health concern.
- Identifying risk factors is essential for developing effective intervention strategies.
Purpose of the Study:
- To identify risk factors associated with delayed MMR vaccination in children.
- To assess parental perceptions of proposed solutions to improve immunization rates.
Main Methods:
- A case-control study design was employed.
- Subjects were children who had or had not received MMR vaccine by age 2.
- Parental surveys were conducted to gather feedback on proposed interventions.
Main Results:
- Maternal education level, frequent household moves, younger maternal age, multiple older siblings, and participation in WIC or food stamp programs were associated with delayed immunization.
- Key risk factors identified include having at least two older siblings, maternal age under 21, and incorrect knowledge of MMR vaccine recommendations.
- Insurance status and cost were not significant predictors of delayed vaccination.
Conclusions:
- Knowledge deficits regarding immunization schedules and specific demographic factors are significant predictors of delayed vaccination.
- Interventions should target families with characteristics such as frequent relocation, multiple children, and younger parents.
- Educational messages about recommended immunization ages are crucial for improving vaccination uptake.
Objectives:
1) To examine a wide range of potential risk factors for delayed childhood immunization against measles, mumps, and rubella and 2) to determine the parental response to proposed solutions regarding the problem of delayed childhood immunization.
Design:
A case-control study in which subjects had (controls) or had not (cases) received measles, mumps, and rubella vaccine (MMR) by 2 years of age. Parents of subjects were also surveyed to find out whether they thought selected proposals to improve immunization rates would be successful.
Results:
Maternal education of high school or less at the time of the child's birth, more than or equal to two moves between birth and age 2, maternal age < 21 years of age at the time of the child's birth, more than or equal to two older siblings, participation in The Special Supplemental Food Program for Women, Infants, and Children (WIC), participation in the federal food stamp program, and incorrect knowledge of the recommended age for MMR significantly elevated the odds ratio (OR) for delayed immunization. At least two older siblings (OR = 3.2), maternal age < 21 years of age at the time of the child's birth (OR = 2.8), and incorrect knowledge of the recommended age for MMR (OR = 2.7) remained significant risk factors in a multivariate logistic regression model. Insurance status and cost factors were not significant risk factors for delayed immunization. Parents though that reminders for immunization and a central record system would have made obtaining immunizations easier.
Conclusions:
Based on our findings of the importance of immunization knowledge and demographic characteristics as risk factors for delayed immunization, we suggest that a message (the recommended age for immunizations) and a target group for that message (families who move frequently, have older children, and are headed by younger parents) be evaluated as an intervention to improve immunization rates.