Other information requested in the annual reports questionnaire (prevalence among the general population and the school population, demand for treatment etc.) is not always available for different years or may be difficult to use for comparative purposes.
年度报告调查表要求的其他资料（普通人口和在校人口中的流行率、治疗需求等）并不是各年都能获得，或可能很难拿来做比较。