“…7,18,[26][27][28][29][30] The European formula was compared to Willems and Haavikko methods on a sample of 1098 OPTs within age range between 6 and 13 years in the previous study from Bosnia and Herzegovina, DA overestimated for 0.09 years for girls (MAE, 0.53 years) and underestimated by -0.02 years for boys (MAE, 0.55 years), very close to our results of the same age range. 18 Contrary to our study in which we analyzed digital OPTs from a single institution, Galić et al 18 used analog OPTs which were photographed by the digital camera. Galić et al 18 collected samples from different regions to represent a population within the entire country more definitively.…”