B. Patient populations vary substantially in average severity of illness from hospital to hospital.

不同的医院的病人群体在平均疾病严重程度上不同。

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An increase in average speed is directly related both to the likelihood of a crash occurring and to the severity of the consequences of the crash.

平均速度的上升与发生碰撞事故的可能性以及碰撞后果的严重性直接相关。

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The study abstract fails to mention that botulinum toxin was not more effective than placebo in reducing the percentage of the day with headache or the average usual severity of headache.

这个研究摘要没有提到肉毒素在减少头痛日的百分比或者平均头痛的严重程度方面并不比空白有效。

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The records showed it took an average of about 10 million years for an ecosystem to become re-established, irrespective of the severity of the extinction.

BBC: Intel follows speedy chip debut

Moreover, other data reviewed by Audit Analytics suggests that the severity of 2012 restatements, as measured by both the impact on net income and by the average number of issues per restatement, was generally less than in the period prior to 2008.

FORBES: Restatements Resurrected?: Accounting Fraud By The Numbers