Below are average adult human heights by country or geographical region. The original studies and sources should be consulted for details on methodology and the exact populations measured, surveyed, or considered. Giorson parsey...
As with any statistical data, the accuracy of such data may be questionable for various reasons:
- Some studies may allow subjects to self-report values. Generally speaking, self-reported height tends to be taller than its measured height, although the overestimation of height depends on the reporting subject's height, age, gender and region.
- Test subjects may have been invited instead of chosen at random, resulting in sampling bias.
- Some countries may have significant height gaps between different regions. For instance, one survey shows there is 10.8 cm (41⁄2 in) gap between the tallest state and the shortest state in Germany.Under such circumstances, the mean height may not represent the total population unless sample subjects are appropriately taken from all regions with using weighted average of the different regional groups.
- Different social groups can show different mean height. According to a study in France, executives and professionals are 2.6 cm (1 in) taller, and university students are 2.55 cm (1 in) taller than the national average. As this case shows, data taken from a particular social group may not represent a total population in some countries.
- A relatively small sample of the population may have been measured, which makes it uncertain whether this sample accurately represents the entire population.
- The height of persons can vary over the course of a day, due to factors such as a height decrease from exercise done directly before measurement (i.e. inversely correlated), or a height increase since lying down for a significant period of time (i.e. positively correlated). For example, one study revealed a mean decrease of 1.54 centimetres (0.61 in) in the heights of 100 children from getting out of bed in the morning to between 4 and 5 p.m. that same day. Such factors may not have been controlled in some of the studies.