Table 4.

Interrupted time series analysis of the annual number of scarlet fever cases in mainland China from January 2011 to May 2022.

Series	Estimate	S.E.	t	P-value
Intercept	40,643	7,588	5.357	<0.001
Preintervention trend	4,396	1,355	3.245	0.012
Intervening variable	−61,526	12,946	−4.753	0.001
Postintervention	−7,981	8,081	0.988	0.352