Neither hereditary periodic fever nor periodic fever, aphthae, pharingitis, adenitis: Undifferentiated periodic fever in a tertiary pediatric center

Table 1 Baseline characteristics and symptoms distribution of patients with periodic fever in our cohort

	Undifferentiated periodic fever (n = 23)	PFAPA (n = 187)	HPF (n = 11)
Females, n (%)	18 (70%)	74 (38%)	7 (63%)
Ethnicity, n
EU	20	183	11
Arabian	2	2	0
Mix	1	2	0
Median age at onset, mo (IQR)	9.5 (4-24)	12.5 (2.5-96)	9 (1-174)
Median age at first visit, mo (IQR)	51 (33-113)	42.15 (8-120)	48 (12-216)
Symptoms, n (%)
Pharyngitis	13 (56.6%)	152 (81.3%)	4 (36.3%)
Aphtae	12 (52.2%)	20 (10.7%)	0 (0%)
Chest pain	0 (0%)	0 (0%)	1 (9%)
Abdominal pain	12 (52.2%)	9 (4.8%)	6 (54.5%)
Musculoskeletal pain	15 (65.2%)	15 (8.0 %)	2 (18.2%)