Table 2. Coefficients from the linear spline model with a knot on 31st July.

	Estimate	Std. Error	t value	Pr(>|t|)
Intercept	5.301	0.096	55.378	0.000
Slope estimate, pre-mask	0.042	0.007	5.858	0.000
Slope estimate, with masks	-0.023	0.017	-1.342	0.190
Change in slope, introduction of mandatory masks	-0.065	0.022	-2.953	0.006

Residual standard error: 0.239 on 29 degrees of freedom; Multiple R-squared: 0.582 Adjusted R-squared: 0.554; F-statistic: 20.21 on 2 and 29 DF, p-value: < 0.001.