Table 2.

Correlation analysis of weekly absenteeism rate, weekly fever rate, and weekly positive rate of influenza virus.

Variables		Weekly positive rate of influenza virus
		t	P value	t–1	P value	t–2	P value	t–3	P value
Data reported by the system
	Weekly absence rate of school A	0.662	<.001	0.638	<.001	0.654	<.001	0.674	<.001
	Weekly absence rate of school B	0.334	.21	0.268	.32	0.391	.13	0.442	.09
	Weekly absence rate of school C	0.771	.009	0.728	.02	0.444	.2	0.222	.54
	Weekly fever rate of school A	–0.368	.03	–0.367	.03	–0.387	.02	–0.363	.03
	Weekly fever rate of school B	0.492	.05	0.589	.02	0.557	.03	0.618	.01
	Weekly fever rate of school C	0.229	.47	0.307	.33	0.056	.86	–0.002	>.99
	Weekly absence and fever rate of school A	0.058	.74	0.045	.79	0.038	.83	0.069	.69
	Weekly absence and fever rate of school B	0.6	.01	0.635	.008	0.687	.003	0.767	.001
	Weekly absence and fever rate of school C	0.686	.03	0.664	.04	0.317	.37	–0.333	.35
Data reported by school physicians
	Weekly absence rate of school A	0.58	.007	0.55	.01	0.59	.006	0.648	.002
	Weekly absence rate of school B	0.429	.11	0.406	.13	0.4	.14	0.379	.16