Figure 3. Posterior expectations of the failure hazard rates for the 1960 cohort containing boys (n = 103) and girls (n = 90). The panels A and B represent boys, and C and D girls. The panels A and C stand for the maxilla, and B and D for the mandible. Molar teeth have the highest failure risk after eruption, with the exception of mandibular first molars, which have the highest risk approximately two years after eruption. (Log-scale on the vertical axis ranges from 1 to 50.)