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In prior studies of febrile seizures (FSs), prolonged FSs were defined, absent empirical evidence, as lasting 10 or 15 minutes or more. We assessed the distribution of FS duration in a cohort with first FSs, and the association between FS duration and baseline characteristics of the children.

We calculated the observed cumulative probability, S(t), that a FS would last at least t minutes, S(t) = exp(−t/τ). Data were also fit using a model obtained as the sum of 2 exponential distributions (S[t] = αexp[−t/τ₁] + [1 − α]exp[−t/τ₂]). After assessing the best fit, the cutoff defining long FS was determined. Logistic regression was used to examine associations between long FSs and baseline characteristics, behavior, and development.

In 158 children with a first FS, median duration was 4.0 minutes. Duration of FS was best fit by a 2‐component mixture exponential model. Using this model, we identified 1 …