Prevalence and age at first detection for selected major diseases.

Each disease is represented by a number of specific SNOMED codes. Ages are shown as mean with standard deviation in brackets. Prevalences are shown as percentages with counts in brackets. Age distributions were compared with a t-test and prevalences were compared with fisher’s exact test.

每种疾病均由若干特定的SNOMED编码（SNOMED codes）表示。年龄以均值（标准差）的形式呈现，标准差标注于括号内；患病率以百分比形式展示，括号内标注对应例数。年龄分布采用t检验进行组间比较，患病率则采用费希尔精确检验进行组间比较。