Ten-year haematological follow-up: mortality and haematological changes.

In a 10-year follow-up study of 543 men and 180 women seen in a community survey in 1958 mortality was examined in relation to the 1958 haematological data, and 91% of the survivors were re-examined. Analyses based on the 1958 haemoglobin and packed cell volume estimations suggested that those with values near the mean may subsequently have lower death rates. Higher death rates occurred in those having low serum iron levels. Comparisons of haemoglobin concentrations and of packed cell volumes in 1958 and 1968 show correlation coefficients (r) between 0.30 and 0.60 in various subgroups.