Table 3: Comparison of proposed definitions of lower limit of normal blood haemoglobin concentration.
|Population||WHO(1968)||NHANES III(1994)||NHANES III(1994)||Present study(2016)|
|White men (g/dL)||13*||13.8**||13.2***||11.2***|
|Black men (g/dL)||12.8||12.7|
|White women (g/dL)||13*>12*||12.2||12.2||13*>11.3***|
|Black women (g/dL)||11.3||11.5|
NHANES III = Third US National Health and Nutrition Examination Survey; NRS = not reported separately; WHO = World Health Organisation.
*WHO numbers did not distinguish normal levels based on age or racial differences; **Values in this column refer to the lowest 5% of actual NHANES III population distribution. The 5% threshold for the normal Gaussian distribution differs by less than 0.2 g/dL in each group; ***Proposed range for the group aged 60 years and older, also based on the 5% actual distribution in the population; ****Present study numbers does not distinguish racial differences due to the multi-ethnicity of the Brazilian population. Data from references [10,15,22].