Table 2

Core questionnaire modules, respondents and objective of each survey wave

Questionnaire* moduleRespondents
(aged ≥18 years)		PurposeTopics and survey instruments
Household
Questionnaire		Household head/main respondent

  • To record the household composition, size, location, roster (list of all members), socioeconomic characteristics, healthcare access, social capital

  • To compare household socioeconomic status

  • To identify individuals with COVID-19 history

  • Demographic characteristics of the household members including age, gender, education level, caste/religion/social group (SC/ST/other)†

  • COVID-19 history

  • Vaccination history

  • Household assets

  • Income

Individual questionnaireAll eligible‡ members of selected household

  • To evaluate the prevalence of COVID-19 history, COVID-19 vaccination history, post-COVID symptoms, morbidity history, health-related quality of life (EQ-5D-5L)

  • To recall health-related quality of life pre-COVID

  • To recall socioeconomic well-being pre-COVID

  • To identify COVID-19 stigma, post-COVID stigma

  • To document respondents’ Disease history

  • To determine Individual-level socioeconomic disadvantage

  • To assess respondents’ mental health, disorder

  • To measure alcohol and tobacco consumption habits

  • EQ-5D-5L (EuroQol health-related quality of life questionnaire).

  • Patient Health Questionnaire

  • General Anxiety Disorder

  • COVID-19 stigma (COVID PSS Scale)

  • Post-COVID, status, history and symptoms

  • Post-COVID stigma questionnaire

  • COVID-19-related symptoms

  • Fagerstrom test

  • Alcohol Use Disorder Identification Test

  • *Each household and eligible individuals will be surveyed four times at equally spaced intervals, over 16 months.

  • †Other backward class.

  • ‡Only respondents with COVID-19 history will be eligible for questions about post-COVID symptoms.

  • SC, scheduled caste; ST, scheduled tribe.