Calculation of the morbid risk using the example of category “both parents unaffected” (category I), with the proband method, simple sib method and Weinberg’s abridged age correction.

MR = morbid risk, N = number of affected persons, B = lifetimes at risk (“Bezugsziffer”), P1 = number of children aged under 14, P2 = number of persons aged 14–68, P3 = number of persons aged above 68.Calculation of the morbid risk using the example of category “both parents unaffected” (category I), with the proband method, simple sib method and Weinberg’s abridged age correction.MR = 发病风险（morbid risk），N = 受累个体数，B = 风险人年数（Bezugsziffer），P1 = 14岁以下儿童人数，P2 = 14~68岁个体人数，P3 = 68岁以上个体人数。以"双亲均未受累"类别（类别I）为例，采用先证者法（proband method）、简易同胞法（simple sib method）以及温伯格简化年龄校正法（Weinberg’s abridged age correction）计算发病风险。