The impact of age on scalp HFO rates in children and adolescents with epilepsy. (A) Younger children (<7 years) showed higher scalp HFO rates than older children (≥7 years). Patients are numbered consecutively, as in Table 1, each depicted with a different colour. A triangle (circle) corresponds to a focal (generalized) epileptogenic zone. Markers with red edges denote the CSWS patients. (B) Scalp HFO rates in younger children (<7 years, N = 16, 2.4 HFO/min, iqr 3.8) were higher than in older children (≥7 years, N = 14, 0.6 HFO/min, iqr 0.5, Wilcoxon rank sum test, P = 0.021).