Fig. 3. Higher seizure recurrence rate (SRR) after 2 years of follow-up in first unprovoked seizures while sleeping (FUS-S) than those while waking (FUS-W). After integrating the seven cohort studies, the SSR was 59.8% in the FUS-S group (A) and 36.5% in the FUS-W group (B). CI, confidence interval.