title: Reliability of India-specific regression formula for age estimation of population in and around Bahadurgarh, Haryana (India).
abstract: OBJECTIVE
  The study was conducted to check the reliability of India-specific regression formula for age estimation of population in and around Bahadurgarh, Haryana (India).
  
  
  METHODS
  The study was conducted using digital orthopantomograms (OPGs) of 464 subjects (253 males and 211 females). Chronologic age (CA) was derived from that mentioned on the OPG. Each tooth in the left mandibular segment was scored using Demirjian's scoring and age was calculated using the regression formulas derived by Acharya. The difference of the chronologic and estimated age was used to check the reliability of India-specific regression formula.
  
  
  RESULTS
  The mean estimated age was found to be significantly higher as compared to CA for overall as well as both the genders independently (p < 0.001). Difference (in ±) between estimated and CA ranged from 0 to 4.2 years. Mean difference in age was 0.85 ± 0.73 years for males and 0.87 ± 0.76 years for females.
  
  
  CONCLUSIONS
  The published India-specific regression formula does not have reliability in the population of Bahadurgarh, Haryana and hence cannot be universally applied.
authors.affiliation: Department of Oral Pathology & Microbiology, PDM Dental College and Research Institute, Bahadurgarh, Haryana, India.
authors.forename: Ankita
authors.initials: A
authors.lastname: Tandon
authors.affiliation: Department of Public Health Dentistry, ITS Dental College Hospital & Research Institute, Greater Noida, Uttar Pradesh, India.
authors.forename: Vartika
authors.initials: V
authors.lastname: Agarwal
authors.affiliation: Research Consultant at APS and Visiting Faculty (Epidemiology and Biostatistics), Lucknow University, Lucknow, Uttar Pradesh, India.
authors.forename: Varun
authors.initials: V
authors.lastname: Arora
keywords: Age estimation; Demirjian's method; Forensic dentistry; India-specific