What are the main differences between EQ-5D-Y-3L and EQ-5D-Y-5L?

The EQ-5D-Y-3L and EQ-5D-Y-5L include the same dimensions (Mobility, Looking after myself, Doing Usual Activities, Having Pain or Discomfort, Feeling Worried, Sad or Unhappy) but the EQ-5D-Y-5L has five response options (or levels of severity) per dimension compared to the EQ-5D-Y-3L’s three levels. The level structure of the EQ-5D-Y-5L and the adult EQ-5D-5L are quite similar, unlike the EQ-5D-Y-3L and EQ-5D-3L, where the differences in wording are greater. For comparisons between adult and paediatric populations it may therefore be preferable to use the EQ-5D-Y-5L and the EQ-5D-5L.