Barry P P
Geriatrics. 1986 Sep;41(9):42-7.
Predictive value is a critical consideration when one is deciding whether to order a specific test on an individual patient in whom the disease status is unknown. Positive tests are most useful when prevalence is high; negative tests are most useful when prevalence is low. Falls from bed, comprising 36% of these accidents, chiefly occurred in the evening or at night, often while the patient was attempting to get in or out of bed, or was sleeping. All these accidents occurred with the bedrails up.
当决定是否对疾病状态未知的个体患者进行特定检查时，预测价值是一个关键考量因素。患病率高时，阳性检查最有用；患病率低时，阴性检查最有用。占这些事故36%的坠床主要发生在傍晚或夜间，通常是在患者试图上床或下床或睡觉时发生。所有这些事故都是在床栏拉起的情况下发生的。
