ISO 28961:2012提供了听力阈值分布的描述性统计百分位数，其平均值为ISO 226和ISO 389-7中规定的参考阈值。在以下条件下指定平均值和百分位阈值:a）没有听者的声场由自由渐进平面波（自由场）组成；b） 声源位于听者正前方（正面入射）；c） 声音信号是纯（正弦）音调；d） 在没有听者的情况下，在听者头部中心的位置测量声压级；e） 倾听是双耳的；f） 听者是年龄在18岁至25岁（含18岁至25岁）之间的耳科正常人。 百分位数以数字形式给出，表示1中的首选频率- 第三个倍频程系列，20 Hz至16 000 Hz（含），符合ISO 266标准，适用于某些中等测听频率。 百分位数适用于评估个人在上述条件下与听阈分布相关的听力。百分位数还可用于评估听阈附近低水平噪声的可听性。

ISO 28961:2012 provides descriptive statistics, percentiles, of the hearing threshold distribution whose mean is the reference threshold value specified in ISO 226 and ISO 389-7. The mean and percentile thresholds are specified under the following conditions: a) the sound field in the absence of the listener consists of a free progressive plane wave (free field); b) the sound source is directly in front of the listener (frontal incidence); c) the sound signals are pure (sinusoidal) tones; d) the sound pressure level is measured in the absence of the listener at the position where the centre of the listener's head would be; e) listening is binaural; f) the listeners are otologically normal persons within the age range 18 years to 25 years inclusive. The percentiles are given in numerical form for the preferred frequencies in the one-third-octave series from 20 Hz to 16 000 Hz inclusive, in accordance with ISO 266, and for some intermediate audiometric frequencies. The percentiles are applicable to the assessment of an individual's hearing in relation to the distribution of hearing thresholds under the above conditions. The percentiles can also be used to evaluate the audibility of low-level noise around hearing threshold.