A simple method to evaluate the massive dose vitamin A prophylaxis program in preschool children

Area of Science:

• Public Health
• Nutrition Epidemiology
• Ophthalmology

Background:

• Large-scale vitamin A prophylaxis programs are implemented in India.
• Evaluating these programs is hampered by a lack of baseline data on vitamin A deficiency prevalence.
• Ocular signs like Bitot's spots are indicators of vitamin A deficiency.

Purpose of the Study:

• To describe a simple evaluation method for the massive dose vitamin A prophylaxis program.
• To assess the program's impact by analyzing the relationship between age and the prevalence of ocular signs of vitamin A deficiency.
• To establish a benchmark for program evaluation using regression coefficients.

Main Methods:

• Utilized the linear relationship between child age and the prevalence of Bitot's spots.
• Compared regression coefficients of areas covered by the program (experimental) with those not covered (control).
• Analyzed a specific area where the program was discontinued to assess its sustained impact.

Main Results:

• Regression coefficients differed significantly between experimental and control areas, indicating program impact.
• Control areas showed a higher prevalence of vitamin A deficiency indicators compared to experimental areas.
• A program-discontinued area showed a lesser, though still significant, degree of efficiency compared to regularly covered areas.

Conclusions:

• The described method effectively evaluates the impact of massive dose vitamin A prophylaxis programs.
• The study suggests using a specific null hypothesis (beta = 0.0065) for future program evaluations.
• Continued program implementation is crucial for sustained reduction of vitamin A deficiency.