Table 2:

Calculation of effectiveness

Terminal node health state	Formula	Reasoning
Healthy, untreated	$\text{[math]}$	Assuming screening occurs at 18 months and health state is experienced for all years following test (using life expectancy of 82 yr37)
Healthy, after treatment	$\text{[math]}$	Assumes there is some decrease in utility for 4 mo during iron supplementation (4/12 mo = 0.33)
Poor functional outcomes, untreated	$\text{[math]}$	Assumes that iron deficiency is not detected and treated, and resulting health state is experienced for all years following test
Poor functional outcomes, after treatment	$\text{[math]}$	Assumes that iron deficiency is not treated despite supplementation, and this health state experiences both decreased utilities from poor functional outcomes, and short-term decrease in utility due to supplementation