COVID-19 Vaccine Survey, Survey 2 2022 - South Africa

Abstract
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The COVID-19 Vaccine Survey (CVACS) is a South African national panel study of individuals initially unvaccinated against COVID-19. CVACS is implemented by the Southern Africa Labour and Development Research Unit (SALDRU) based at the University of Cape Town. The same respondents are interviewed twice, a few months apart, in 2021 and then 2022, to gather information about their attitudes, beliefs and intentions regarding COVID-19 vaccination. The purpose of CVACS is to collect high quality, timely, and relevant information on facilitators and barriers to COVID-19 vaccine uptake - including vaccine hesitancy and access constraints - to contribute to the development of data-driven campaigns and programmes to increase COVID-19 vaccination uptake in South Africa. In comparison to Survey 1, Survey 2 collected data on unvaccinated and vaccinated respondents. Final data files are:
Unvaccinated (as was in S1)
Vaccinated (New to S2)
derived (As in S1)
Link_File (New in S2 - this links the panel)

Geographic coverage
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CVACS was not designed to be, and should not be used as a prevalence study. The data cannot be considered to be nationally representative of all unvaccinated individuals in South Africa.

Analysis unit
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Households and individuals

Kind of data
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Sample survey data

Sampling procedure
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CVACS Survey 1 was obtained from a stratified sample drawn from the GeoTerraImage (GTI) 2021 sampling frame (https://geoterraimage.com/), using individuals aged eighteen and older. The sample was primarily stratified across the following categories: province, population group, geographic area type (metro, non-metro urban, non-metro rural) and the neighbourhood lifestyle index (NLI), in groups of NLI 1-2, NLI 3-4, and NLI 5-10. Age categories defined according to the COVID-19 vaccination age groups (18-34, 35-49, 50-59, 60+), and gender were used as further explicit stratification variables. A credit bureau database was linked to this database at the enumeration area level, including individuals who had applied for credit, regardless of the outcome, and individuals who have had a credit check.

The CVACS Sample in Survey 2 included individuals from Survey 1 who were re-interviewed, who fell into two categories: vaccinated between Survey 1 and 2, or those remaining unvaccinated. In order to realise an unvaccinated sample of similar size to Survey 1, a top-up sample of unvaccinated individuals was interviewed. These individuals were drawn from the same sampling frame as Survey 1. Younger and female respondents were less likely to be re-interviewed in Survey 2. The full Survey 2 unvaccinated sample is more skewed to the younger age categories, due to higher vaccination rates among the elderly precluding many from inclusion into the study.

Mode of data collection
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Computer Assisted Telephone Interview

Research instrument
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Data was collected for Survey 2 with two questionnaires, one for vaccinated and one for unvaccinated respondents. CVACS used computer-assisted telephone interviews (CATI). The CVACS questionnaires were translated into all South African languages and interviews were conducted in the preferred language of the respondent. Most of the survey questions collected individual-level data, with some household level data also collected through the individual questionnaire.

{'Abstract': '《COVID-19疫苗调查》（CVACS）系南非针对最初未接种COVID-19疫苗的个人开展的国家层面横断面研究。CVACS由位于开普敦大学的南部非洲劳动与发展研究单位（SALDRU）实施。同一受访者于2021年和2022年分别接受两次访谈，相隔数月，以收集其关于COVID-19疫苗接种的态度、信念和意图信息。CVACS旨在收集高质量、及时且相关的信息，以揭示促进和阻碍COVID-19疫苗接种的因素，包括疫苗接种犹豫和获取限制，从而为南非提高COVID-19疫苗接种率的数据驱动型宣传活动和项目的发展贡献力量。与第一轮调查相比，第二轮调查收集了未接种疫苗和已接种疫苗受访者的数据。最终数据文件包括：
未接种疫苗（S1中已有）
已接种疫苗（S2新增）
派生数据（与S1相同）
链接文件（S2新增 - 该文件连接了横断面数据）
', 'Geographic coverage': 'CVACS并非设计为流行病学研究，不应作为南非所有未接种疫苗个人的全国代表性样本使用。
', 'Analysis unit': '家庭和个人
', 'Kind of data': '样本调查数据
', 'Sampling procedure': 'CVACS第一轮调查的数据来源于从GeoTerraImage（GTI）2021抽样框架中抽取的分层样本（https://geoterraimage.com/），样本中包含18岁及以上的个人。样本主要按照以下类别进行分层：省份、人口群体、地理区域类型（都市、非都市城市、非都市农村）和邻里生活方式指数（NLI），分为NLI 1-2、NLI 3-4和NLI 5-10组。根据COVID-19疫苗接种年龄组（18-34岁、35-49岁、50-59岁、60岁以上）和性别定义的年龄类别被用作进一步的明确分层变量。信用局数据库与该数据库在人口普查区级别相连接，包括申请过信用且不论结果如何的个人，以及进行过信用审查的个人。
CVACS第二轮调查的样本包括第一轮调查中接受重新访谈的个人，分为两类：在第一轮和第二轮之间接种疫苗的，或继续保持未接种疫苗状态的个人。为了实现与第一轮调查相似规模的未接种疫苗样本，对未接种疫苗的个人进行了补充抽样。这些个人来自与第一轮调查相同的抽样框架。在第二轮调查中，年轻和女性受访者重新接受访谈的可能性较低。由于老年人中疫苗接种率较高，导致许多老年人被排除在研究之外，因此第二轮调查的未接种疫苗样本在年轻年龄组中更为倾斜。
', 'Mode of data collection': '计算机辅助电话访谈
', 'Research instrument': 'CVACS第二轮调查使用了两份问卷，一份用于已接种疫苗的受访者，另一份用于未接种疫苗的受访者。CVACS采用了计算机辅助电话访谈（CATI）。CVACS问卷被翻译成所有南非语言，访谈使用受访者偏好的语言进行。大多数调查问题收集了个人层面的数据，通过个人问卷也收集了一些家庭层面的数据。
'}