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. 2021 Jul 7;6:820–831. doi: 10.1016/j.idm.2021.06.004

Table 1.

Percentage improvements obtained by different plausible individual NPIs and combinations of two NPIs that should have been made stringent for the control of virulent COVID-19 pandemic with lowering Rts; Percentage improvements are calculated comparing the mean of Rts of ‘base case’ (mean = 1.52) with the means of improved cases given in the table.

Case # Type of NPI made stringent Mean of Rts % Improvement achieved
Individual NPIs made stringent Case 1 NPI 1 (Contact tracing) 0.46 69.43
Case 2 NPI 3 (Social distancing and health screening) 1.48 2.06
Case 3 NPI 4 (Hand hygiene) 1.46 3.88
Case 4 NPI 6 (Lockdown and isolation) 1.26 17.08
Case 5 NPI 7 (Health-related supports) 1.18 22.16
Combinations of twin NPIs made stringent Case 1 NPI 1 (Contact tracing) 1.22 19.77
NPI 6 (Lockdown and Isolation)
Case 2 NPI 1 (Contact tracing) 1.30 14.12
NPI 7 (Health-related supports)
Case 3 NPI 6 (Lockdown and isolation) 1.01 31.92
NPI 7 (Health-related supports)
Case 4 NPI 1 (Contact tracing) 1.06 29.89
NPI 2 (Quarantine efforts)