Standardized diagnosis of pneumonia in developing countries.

The World Health Organization recommends the use of raised respiratory rate and chest wall indrawing to enable health workers in developing countries to diagnose pneumonia. We evaluated the current World Health Organization guidelines for management of the child with cough or difficult breathing in Manila, Philippines and Mbabane, Swaziland using an identical protocol in both countries. Raised respiratory rate was defined as greater than or equal to 50/minute for children ages 2 to 12 months and greater than or equal to 40/minute for children 12 months to 5 years. Chest wall indrawing was defined as inward movement of the bony structures of the lower chest wall with inspiration. In the Philippines raised respiratory rate or chest wall indrawing, when applied by a pediatrician, was found to have a sensitivity of 0.81 and specificity of 0.77 for predicting pneumonia as determined by a pediatrician with the aid of a chest roentgenogram. In Swaziland the sensitivity was 0.77 and the specificity was 0.80. When applied by health workers the sensitivity was similar but the specificity was lower. The current World Health Organization ARI case management guidelines predicted pneumonia with similar sensitivity and specificity in two very different developing countries, the Philippines and Swaziland.

Using cost-effectiveness analysis to evaluate targeting strategies: the case of vitamin A supplementation.

Given the demonstrated efficacy of vitamin A supplements in reducing childhood mortality, health officials now have to decide whether it would be efficient to target the supplements to high risk children. Decisions about targeting are complex because they depend on a number of factors; the degree of clustering of preventable deaths, the cost of the intervention, the side-effects of the intervention, the cost of identifying the high risk group, and the accuracy of the 'diagnosis' of risk. A cost-effectiveness analysis was used in the Philippines to examine whether vitamin A supplements should be given universally to all children 6-59 months, targeted broadly to children suffering from mild, moderate, or severe malnutrition, or targeted narrowly to pre-schoolers with moderate and severe malnutrition. The first year average cost of the universal approach was US$67.21 per death averted compared to $144.12 and $257.20 for the broad and narrow targeting approaches respectively. When subjected to sensitivity analysis the conclusion about the most cost-effective strategy was robust to changes in underlying assumptions such as the efficacy of supplements, clustering of deaths, and toxicity. Targeting vitamin A supplements to high risk children is not an efficient use of resources. Based on the results of this cost-effectiveness analysis and a consideration of alternate strategies, it is apparent that vitamin A, like immunization, should be provided to all pre-schoolers in the developing world. Issues about targeting public health interventions can usefully be addressed by cost-effectiveness analysis.

PIP: It has been established that vitamin A supplementation can help reduce levels of child mortality. Findings are reported from a cost-effectiveness study in the Philippines undertaken to determine whether vitamin A supplements should be given universally to all children age 6-59 months; targeted broadly to children with mild, moderate, or severe malnutrition; or targeted narrowly to preschoolers with moderate and severe malnutrition. Whether to target supplementation depends upon the degree of clustering of preventable deaths, the cost of the intervention, the side effects of the intervention, the cost of identifying the high risk group, and the accuracy of the diagnosis of risk. The first year average cost of the universal approach would be US$67.21 per death averted, $144.12 for the broad targeting approach, and $257.20 for the narrow approach. Targeting vitamin A supplements to high-risk children is therefore not an efficient use of resources. Vitamin A, like immunization, should be provided to all preschoolers in the developing world.