this issue, a modified ridit transformation (Bross, 1958) was performed to adjust the measure of environmental exposure by the sample size at each level of childhood adversity. The modified ridit transformation determines a score for each category, which is defined as the percentile rank of an item in the population. Therefore, each ridit score reflects the category severity of an ordinal scale and sample size for each level and limits the variance of each level to produce a measure with a uniform distribution having a range between 0 and 1.
