Determining the exact percentage of people with curly hair is difficult since hair texture varies among individuals and can be influenced by genetic and environmental factors. However, research suggests that approximately 65-85% of people in the world have straight or wavy hair, while the remaining 15-35% have some degree of curliness to their hair.
The shape of the hair follicle is the primary factor that determines hair texture, and the curvature of the follicle determines whether the hair is straight, wavy, or curly. Individuals with straight hair have round follicles, while those with curly hair have oval or elliptical-shaped follicles. The more elliptical the follicle, the curlier the hair.
Curly hair is more common among people of African and African-American descent, with estimates suggesting that up to 80-90% of individuals of African descent have naturally curly or coiled hair. Similarly, individuals of Mediterranean and Hispanic descent are more likely to have curly hair, with estimates ranging from 45-85%.
In contrast, individuals of Asian and Caucasian descent are less likely to have curly hair. In Asian populations, estimates suggest that less than 10% of individuals have curly hair, while in Caucasian populations, estimates range from 10-15%. However, these estimates can vary depending on the specific population and the definition of curly hair used.
It is important to note that these percentages are based on self-reported hair texture and may not accurately reflect the true prevalence of curly hair. Additionally, hair texture can change over time due to factors such as aging, hormonal changes, and chemical treatments, which can make it difficult to determine a precise percentage of individuals with curly hair.
In conclusion, while the exact percentage of people with curly hair is difficult to determine, estimates suggest that approximately 15-35% of people in the world have some degree of curliness to their hair, with the highest prevalence among individuals of African and African-American descent, and lower prevalence among individuals of Asian and Caucasian descent.