Olson D G, Levy R L, Evans C A, Olson S K
Am J Public Health. 1981 Jun;71(6):631-4. doi: 10.2105/ajph.71.6.631.
One hundred twenty-four children identified as needing care in two elementary schools by a routine department of public health screening were randomly assigned to either a standard treatment group (notification to parents by a form letter) or an experimental group that added personal contact to the standard treatment. Overall, 53 percent of the subjects in the experimental condition who needed treatment at the initial screening had received this treatment at follow-up, while only 12 per cent of the subjects in the control group had received needed treatment.
在一次常规公共卫生筛查中，两所小学里被认定需要护理的124名儿童被随机分配到标准治疗组（通过格式信函通知家长）或实验组，实验组在标准治疗基础上增加了个人联系。总体而言，在初次筛查时需要治疗的实验组受试者中，有53%在随访时接受了该治疗，而对照组中只有12%的受试者接受了所需治疗。
