Return to Work, School, or Usual Activities of Daily Living (ADLs): Subgroup Results. A: FabAV: Crotaline Polyvalent Immune Fab (ovine). Subgroup size: FabAV n = 15; No FabAV n = 5. B: Subgroup size: Mild n = 1, Moderate n = 16, Severe n = 3. C: Subgroup size: Upper extremity n = 10, Lower extremity n = 10.