Table 4.

Relationships between possible predictors of the effective population sizes of the most predominant variants of COVID-19.

Lineage	Mobility	Stringency index	Vaccinated	Mask use	Cases
B.1.1	0.06 (0.009)*	0.35 (6.64e−11)*	NA	0.82 (<2.2e−16)*	0.21 (1.07e−06)*
B.1.111	0.75 (<2.2e−16)*	0.17 (1.02e−05)*	NA	0.21 (9.996e−07)*	0.61 (<2.2e−16)*
B.1.1.348	0.37 (9.93e−12)*	0.20 (1.96e−06)*	NA	0.02 (0.08)	0.11(0.0003)*
B.1.420	0.72 (<2.2e−16)*	0.33 (1.65e−10)*	NA	0.27 (1.006e−08)*	0.75 (<2.2e–16)*
B.1.617+AY (Delta)	0.81 (<2.2e−16)*	0.60 (<2.2e−16)*	0.67 (<2.2e–16)*	0.76 (<2.2e−16)*	0.10 (0.0004)*
P.1 (Gamma)	0.51 (<2.2e−16)*	0.54 (<2.2e−16)*	0.60 (<2.2e–16)*	0.49 (<2.2e−16)*	0.03 (0.03)*
B.1.621 (Mu)	−0.0006 (0.33)	0.01 (0.15)	−0.009 (0.84)	−0.008 (0.65)	0.28 (7.907e–09)*
B.1.1.7 (Alpha)	0.10 (0.0007)*	0.09 (0.001)*	0.08 (0.007)*	−0.01 (0.92)	0.002 (0.25)
C.37 (Lambda)	−0.007 (0.60)	0.21 (6.51e−07)*	0.48 (1.58e−13)*	0.41 (2.26e−13)*	0.05 (0.01)*
Omicron	0.11 (0.0004)*	0.14 (4.39e−05)*	0.87 (<2.2e−16)*	0.61 (<2.2e–16)*	0.11 (0.0004)*

We tested five predictors using a linear regression between a response variable (N_e of each variant) and one variable or predictor (explanatory variables). The values in the table show the adjusted R-squared and (p-value). *: statistically significant. NA means that the variable was not recorded for all period of time that a particular variant circulated.