A sequential mixed-mode data collection, online-to-telephone, was introduced into the National Child Development Study for the first time at the study's age 55 sweep in 2013. The study included a small experiment, whereby a randomised subset of study members was allocated to a single mode, telephone-only interview, in order to test for the presence of mode effects on participation and measurement. Relative to telephone-only, the offer of the Web increased overall participation rates by 5.0 percentage points (82.8% vs. 77.8%; 95% confidence interval for difference: 2.7% to 7.3%). Differences attributable to mode of interview were detected in levels of item non-response and response values for a limited number of questions. Most notably, response by Web (relative to telephone) was found to have increased the likelihood of non-response to questions relating to pay and other financial matters, and increased the likelihood of ‘less desirable’ responses. For example, response by Web resulted in the reporting of more units of alcohol consumed, and more negative responses to subjective questions such as self-rated health, self-rated financial status and well-being. As there was evidence of mode effects, there is the potential for biases in some analyses, unless appropriate techniques are utilised to correct for these.

中文翻译：

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在纵向出生队列研究的混合模式随访中使用网络的影响：来自国家儿童发展研究的证据

2013 年 55 岁的国家儿童发展研究首次将连续混合模式数据收集引入到国家儿童发展研究中。该研究包括一个小型实验，其中研究成员的随机子集是分配给单一模式，仅电话采访，以测试模式对参与和测量的影响的存在。相对于仅电话，网络的提议将整体参与率提高了 5.0 个百分点（82.8% 对 77.8%；差异的 95% 置信区间：2.7% 至 7.3%）。在有限数量的问题的项目不响应和响应值的水平上检测到了可归因于访谈方式的差异。最为显着地，网络回复（相对于电话）被发现增加了不回复与薪酬和其他财务事项相关的问题的可能性，并增加了“不太理想”回复的可能性。例如，网络的回应导致报告更多单位的酒精消耗，以及对主观问题的更多负面回应，如自我评估的健康状况、自我评估的财务状况和幸福感。由于存在模式效应的证据，因此在某些分析中可能存在偏差，除非使用适当的技术来纠正这些偏差。以及对主观问题的更多负面反应，例如自我评价的健康状况、自我评价的财务状况和幸福感。由于存在模式效应的证据，因此在某些分析中可能存在偏差，除非使用适当的技术来纠正这些偏差。以及对主观问题的更多负面反应，例如自我评价的健康状况、自我评价的财务状况和幸福感。由于存在模式效应的证据，因此在某些分析中可能存在偏差，除非使用适当的技术来纠正这些偏差。