Cephalic Index Variation in the Indigenous Population of Tribal Districts in Himachal Pradesh.

Introduction The cephalic index (CI) is the most commonly used index to determine the race of an individual. It is calculated as the ratio of the breadth of the skull to the length of the skull multiplied by 100. The CI of an individual can be influenced by factors such as race, ethnicity, genetic predisposition, lifestyle choices, nutritional habits, environmental factors, and climatic conditions. Material and methods This study was carried out on 413 individuals in the tribal districts of Himachal Pradesh (Kinnaur, Spiti, and Lahaul), with 247 (59.8%) male and 166 (40.2%) female subjects. Measurements of the skull were taken using a spreading caliper. The CI was calculated using Hardlika's method and data were analyzed using IBM SPSS version 27 (IBM Corp., Armonk, NY, US). Results The head shapes of the majority of the tribal population of Himachal Pradesh are mesocephalic, with the mean CI for males and females being 78.90 and 79.81, respectively, without any significant difference. The mean CI of the overall population is 79.27. The majority population of the Kinnaur district is brachycephalic, while the Spiti and Lahaul populations are mesocephalic with females predominately brachycephalic and males predominately mesocephalic. Conclusion The Indigenous population of Himachal Pradesh is mesocephalic with females predominately brachycephalic.