Table 5.

Correlation of the number of scarlet fever cases with each NPI from January 2011 to May 2022.

		Cases	c1	c2	c3	c4	c5	c6	c7	c8
Cases	r	1	−0.449**	−0.454**	−0.460**	−0.460**	−0.384**	−0.437**	−0.453**	−0.444**
c1	r	−0.449**	1	0.964**	0.978**	0.977**	0.838**	0.948**	0.974**	0.910**
c2	r	−0.454**	0.964**	1	0.982**	0.981**	0.836**	0.979**	0.986**	0.914**
c3	r	−0.460**	0.978**	0.982**	1	0.998**	0.838**	0.958**	0.989**	0.956**
c4	r	−0.460**	0.977**	0.981**	0.998**	1	0.836**	0.957**	0.986**	0.956**
c5	r	−0.384**	0.838**	0.836**	0.838**	0.836**	1	0.866**	0.859**	0.796**
c6	r	−0.437**	0.948**	0.979**	0.958**	0.957**	0.866**	1	0.970**	0.900**
c7	r	−0.453**	0.974**	0.986**	0.989**	0.986**	0.859**	0.970**	1	0.929**
c8	r	−0.444**	0.910**	0.914**	0.956**	0.956**	0.796**	0.900**	0.929**	1

Pearson correlation coefficient is “r”.

^**P < 0.01.

Eight specific NPIs in OxCGRT's containment and closure policy: school closures (c1), workplace closures (c2), cancellation of public events (c3), restrictions on public gatherings (c4), closures of public transport (c5), stay-at-home requirements (c6), restrictions on internal movements (c7), and international travel controls (c8).