Hemoglobin counts were measured in the IFLS using the Hemocue meter, which uses a small drop of blood obtained from pricking the respondents’ finger. Because hemoglobin levels are measured for all respondents over 1 year old, as opposed to all respondents over 9 years old as was the case with lung capacity, the sample size is some three thousand observations larger for these estimation. Hemoglobin reflects the sufficiency of blood (or iron in the blood) through the body.