How many people are really left-handed—and why it matters
If there is one thing that is for certain about left-handers, it is that they are much rarer than right-handers. But how much of the world’s population is actually left-handed? Scientific studies have given widely varying answers to this question, ranging from less than 3% to more than 15%. This wide variation is likely due to two factors: cultural effects and small study samples.
Most scientific studies are only conducted in people from one country. But it has been shown that the country in which the data is collected can have a huge impact on handedness measures. For example, a recent study found that people born in England had a 10.1% chance of being left-handed, while people born outside the U.K. only had a 6.8% chance .
A team of researchers led by Greek scientist Marietta Papadatou-Pastou from the National and Kapodistrian University of Athens set out to solve this problem by conducting the biggest ever global study on left-handedness, which has just been published in the journalThe research team from Athens, the University of Oxford, the University of Bristol, Ruhr University Bochum in Germany and the University of St Andrews in Scotland conducted a meta-analysis of 262 datasets from 200 different published...
Overall, more than 2.3 million individuals were included in the study, making this the largest published study on left-handedness so far. They found that across studies, the prevalence of left-handedness lies between 9.3% and 18.1%, with the best overall estimate being 10.6%. So given these new results, how many people in the world are left-handed? As of March 2020, the world’s overall population is estimated to be somewhere around 7.8 billion people, and 10.
Getting an accurate understanding of how many people are left-handed is important for many fields in psychology and related sciences. For example, it can help in understanding human evolution. While many species show left-handedness (see my blog post on cats
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