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 OJEpi  Vol.11 No.1 , February 2021
An Interrupted Time Series Analysis of COVID-19 Positivity before, during and after Lockdown in Four States of India
Abstract: Objectives: The objective of this study was to examine the impact of large scale non-pharmaceutical interventions on COVID-19 pandemic. Methods: We used interrupted time series analysis (ITS), a quasi-experimental model to evaluate the effect of interventions in four states of India by comparing the COVID-19 positivity before lockdown, during lockdown and opening-up period. Results: The positivity in all the four states declined during lockdown and the trends reversed soon after the lockdown measures were relaxed as the states opened-up. The rate of reduction of positivity was significantly different between states. Between the lockdown and opening-up period, an increase in positivity was recorded in all the states with significant variation between states. Conclusion: The analysis provides conclusive evidence that the lockdown measures had a positive effect in reducing the burden of COVID-19 and establishes a causal relationship.
Cite this paper: Tetali, S. , Jammy, G. , Asirvatham, E. , Kumar, B. and Choudhury, L. (2021) An Interrupted Time Series Analysis of COVID-19 Positivity before, during and after Lockdown in Four States of India. Open Journal of Epidemiology, 11, 47-55. doi: 10.4236/ojepi.2021.111005.
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