. 2018 Jun 19;50(2):120–127. doi: 10.3947/ic.2018.50.2.120

Table 3. Comparison of hemorrhagic fever with renal syndrome occurrence by quarter between the nationwide and Yeoncheon cohorts.

	Nationwide^a	Yeoncheon^a	P-value^b
First quarter (January-March)	600 (9.8)	11 (17.7)	0.037
Second quarter (April-June)	597 (9.7)	13 (21.0)	0.003
Third quarter (July-September)	793 (12.9)	16 (25.8)	0.003
Fourth quarter (October-December)	4,142 (67.5)	22 (35.5)	<0.001

^aAll variables are expressed as number (percentage).

^bStatistical significance was tested by χ² or Fisher’s exact tests.