Kletke P R, Davidson S M, Perloff J D, Schiff D W, Connelly J P
Health Serv Res. 1985 Dec;20(5):503-23.
This article compares two measures of the extent of physician participation in Medicaid programs. The first, which has been used in most research to date on the subject, is based on physician estimates of the proportion of their patients who are Medicaid patients. The second derives from encounter forms for a sample of visits to the interviewed physicians. The comparison shows that physicians in the sample tended to overestimate by 40 percent the extent of their Medicaid participation. Because the two measures are highly correlated, the analysis of the determinants of Medicaid participation was not affected by the measure used. However, since physicians tended to overstate the proportion of Medicaid patients in their practices, interview data should not be used to measure the amount of physician participation or to calculate elasticities for the effects of policy changes on the extent of participation.
本文比较了衡量医生参与医疗补助计划程度的两种方法。第一种方法是基于医生对其医疗补助患者在患者总数中所占比例的估计，在迄今为止关于该主题的大多数研究中都采用了这种方法。第二种方法来自对受访医生的部分就诊记录样本。比较结果显示，样本中的医生往往高估了他们参与医疗补助计划的程度，高估幅度达40%。由于这两种方法高度相关，所以对医疗补助计划参与度决定因素的分析不受所采用方法的影响。然而，由于医生往往会高估其执业中医疗补助患者的比例，因此访谈数据不应被用于衡量医生的参与程度，也不应被用于计算政策变化对参与程度影响的弹性。
