COVID-19 High Frequency Phone Survey 2021 - Brazil

Abstract
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The Brazil 2021 COVID-19 Phone Survey was conducted to provide information on how the pandemic had been affecting Brazilian households in 2021. It was inspired by the Latin America and Caribbean High Frequency Phone Surveys and collected information along multiple dimensions relevant to the welfare of the population (e.g. changes in employment and income, coping mechanisms, access to health and education services, gender inequalities, and food insecurity). A total of 2,166 phone interviews were conducted across all Brazilian states between July 26 and October 1, 2021. The survey followed a Random Digit Dialing (RDD) sampling methodology using a dual sampling frame of cellphone and landline numbers. The sampling frame was stratified by type of phone and state. Results are nationally representative for households with a landline or at least one cell phone and of individuals of ages 18 years and above who have an active cell phone number or a landline at home.

Geographic coverage
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National coverage

Analysis unit
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Households and individuals of 18 years of age and older.

Universe
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Households with a landline or in which at least one member has a cell phone, and individuals 18 years of age or above who have an active cell phone number or a landline at home.

Kind of data
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Sample survey data [ssd]

Sampling procedure
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The sample is based on a dual frame of cell phone and landline numbers that was generated through a Random Digit Dialing (RDD) process and consisted of all possible phone numbers under the national phone numbering plan. Numbers were screened through an automated process to identify active numbers and cross-checked with business registries to identify business numbers not eligible for the survey. This method ensures coverage of all landline and cellphone numbers active at the time of the survey. The sampling frame was stratified by type of phone and state.

See Sampling Design and Weighting document for more detail

Mode of data collection
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Computer Assisted Telephone Interview [cati]

Research instrument
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Available in Portuguese. The questionnaire followed closely the LAC HFPS Questionnaire of Phase II Wave I but had some critical variations.

Response rate
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Response rates for landline phones and cell phones were 11.3 percent and 8.5 percent, respectively. Sizes of the samples drawn from the frames were based on the expectation of low response rates for phone surveys.

See Sampling Design and Weighting document for more detail.

{'Abstract': '2021年巴西COVID-19电话调查旨在提供有关该疫情在2021年如何影响巴西家庭的信息。该调查深受拉丁美洲及加勒比海地区高频电话调查的启发，并从多个维度收集了与人口福祉相关的信息（例如，就业和收入的变化、应对机制、获取医疗和教育服务、性别不平等以及粮食不安全）。2021年7月26日至10月1日期间，共进行了2,166次电话访谈，涵盖巴西所有州。调查采用随机数字拨号（RDD）抽样方法，利用手机和固定电话号码的双重抽样框架。抽样框架根据电话类型和州进行分层。调查结果对拥有固定电话或至少一部手机的户主，以及18岁及以上拥有活跃手机号码或家中固定电话的个体具有全国代表性。', 'Geographic coverage': '全国覆盖', 'Analysis unit': '家庭及18岁及以上个体。', 'Universe': '拥有固定电话或至少一名成员拥有手机的户主，以及18岁及以上拥有活跃手机号码或家中固定电话的个体。', 'Kind of data': '样本调查数据 [ssd]', 'Sampling procedure': '样本基于通过随机数字拨号（RDD）过程生成的手机和固定电话号码的双重框架，包括国家电话编号计划下的所有可能的电话号码。通过自动化流程筛选号码以识别活跃号码，并通过与商业登记册核对以识别不符合调查资格的商业号码。此方法确保覆盖调查期间所有活跃的固定电话和手机号码。抽样框架根据电话类型和州进行分层。

详见抽样设计和加权文档以获取更多详细信息。', 'Mode of data collection': '计算机辅助电话访谈 [cati]', 'Research instrument': '问卷以葡萄牙语提供。问卷紧密遵循LAC HFPS第二阶段第一波调查问卷，但存在一些关键差异。', 'Response rate': '固定电话和手机的回应率分别为11.3%和8.5%。从框架中抽取的样本大小基于电话调查预期低回应率的预期。

详见抽样设计和加权文档以获取更多详细信息。'}