METHODOLOGIC ISSUES RELATED TO RANDOM DIGIT DIALING

提出了两个项目来研究两种方法 与使用Waksberg的随机程序有关的问题 基于人群的病例对照研究中的数字拨号。这个 具体目标是：1)确定和优化之前的时间 拨打的不符合条件的电话号码(定义为 工作，商务，错了县，快忙，慢忙，没有 可以将联系电话号码返回到采样池 以及2)确定地理聚集性是否超过 当有多个控件时， 按主采样单位(PSU)选择。的总体目标 这两个项目是：制定指导方针和建议，1) 将不符合资格的电话号码恢复至 采样池，以及2)可选择多个 每个PSU的控制。在项目1中，不符合条件的电话号码 将确定六项可追溯到1979年的病例对照研究。 不符合资格的电话号码百分比(约9,061 号码)将被转换为住宅号码 通过拨打该号码和/或检查其状态确定 针对电话公司的Scantel查号协助 数据库。将在所有住宅区进行家庭普查 数字。这些数据将用于1)估计 按年龄和性别进行选择的概率，如果 被归类为不符合条件的号码被转换为住宅 不同时间点的数字和2)提供 关于将数字返回给 采样池。在项目2中，大约1,029个地址 从之前的三项病例对照研究中选择的对照将是 映射以确定是否使用不同的 Waksberg方法的变体(例如，仅基数， 主要号码和次要号码)群集量超过 在偶然的情况下。这两个项目的发现可能会有一个 对研究设计和研究成本的重大影响--两个方面 这将在提出的建议中得到解决。

Two projects are proposed to investigate two methodological issues related to the use of Waksberg's procedures for random digit dialing in population-based case-control studies. The specific aims are: 1) to identify and optimal time when previously dialed ineligible telephone telephone numbers (defined as non- working, business, wrong county, fast busy, slow busy, and no contact telephone numbers can be returned to the sampling pool and 2) to determine if geographical clustering occurs more than would be expected by chance when more than one control is selected per Primary Sampling Unit (PSU). The general aims of both projects are: to develop guidelines and recommendations, 1) for the restoration of ineligible telephone numbers to the sampling pool, and 2) for the possible selection of more than one control per PSU. In Project 1, ineligible telephone numbers from six case-control studies dating back to 1979 will be identified. The percentage of ineligible telephone numbers (about 9,061 numbers) that have converted to residential numbers will be determined by calling the number and/or checking its status against the telephone company's ScanTel Directory Assistance Data Base. A household census will be taken at all residential numbers. These data will be used 1) to estimate changes in the probability of selection by age and sex that would occur if the numbers classified as ineligible were converted to residential numbers at various points in time and 2) to provide recommendations about the optimal time to return numbers to the sampling pool. In Project 2, the addresses of approximately 1,029 controls selected from three previous case-control studies will be mapped to determine if controls selected using different variations of the Waksberg method (e.g., primary numbers only, primary and secondary numbers) cluster more than would be expected by chance. The findings from both projects could have a significant impact on study design and study costs -- two areas that will be addressed in the recommendations that are made.