The frequency of treatment is determined by the prevalence of infection or visible haematuria (in the case of urogenital schistosomiasis) in school-age children.

干预频率根据学龄儿童中的感染率或可见血尿（只适用于尿路血吸虫病）的发生率确定。

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Chronic rhinitis and its association with headache frequency and disability in persons with migraine: Results of the American migraine Prevalence and Prevention (AMPP) Study.

【译】慢性鼻炎和其协会与头痛的频率和残疾的人与偏头痛：美国偏头痛流行和预防结果(AMPP)的研究。

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In recent years, Equine Influenza showed those characters, wide prevalence, high frequency of outbreak, short interval epidemic time.

近年来，全球马流感的流行呈现流行范围广、发病频次高、发生年度连续性强的特点。

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Writing in JAMA, the researchers led by Dr Lee Cohen, said the prevalence of depression in reproductive age women, their level of anti-depressant use and the frequency of unplanned pregnancy, it was important to be able to tell patients about comparative risk of relapse linked to stopping or continuing with their medication.

BBC: NEWS | Health | Pregnancy 'no depression guard'