Field validation of the Tallstick in marginal communities in Nicaragua.

The Tallstick is a new, simplified anthropometric field tool which allows immediate visual interpretation of height-for-age. This tool was field tested in community-based programmes in Managua, Nicaragua, and the rural community of Los Zarzales, screening 1004 children aged 0-60 months for nutritional stunting. Overall sensitivity and specificity analysis comparing HAZ scores and Tallstick results revealed that the Tallstick correctly identified 83-85 per cent of severely stunted children (HAZ < -2.5) and two-thirds of those with HAZ of -2 and below. It also had good positive predictive value for the mildly stunted. As a screening tool for low weight-for-age, the Tallstick performed better than arm circumference. The best of the community volunteers trained with the Tallstick could use it as well as their trainers. Progressive stunting was found in the 280 children in the sample who did not receive any form of milk. The advantages of the Tallstick for community-level screening and the importance of sustained linear growth are discussed.