condition mean min max ZT0-3 0.06874 0.06874 0.06874 ZT4-7 0.342205 0.342205 0.342205 ZT8-11 0.72625 0.72625 0.72625 ZT12-15 0.901453 0.901453 0.901453 ZT16-19 0.524622 0.524622 0.524622 ZT20-23 0.413368 0.413368 0.413368