Table 2.

Seasons and possible causes for HSP.

	NR (n = 240)	R (n = 128)	χ 2	p-value
Onset seasons
Autumn and winter	144	73	0.304	0.581
RI	162	85	0.045	0.832
Fever	14	8	0.026	0.872
Cough	43	23	0.000	0.990
Pharyngalgia	144	73	0.304	0.581
Allergy	17	12	0.604	0.437
Vaccination	14	8	0.026	0.872
Injury	2	0	0.000	1.000
Unknown cause	45	23	0.034	0.854

GI, gastrointestinal; NR, non-recurrence group; R, recurrent group; RI, respiratory tract infection.