condition mean min max ZT0-3 0.5334105 0.5334105 0.5334105 ZT4-7 0.910377 0.910377 0.910377 ZT8-11 6.39814 6.39814 6.39814 ZT12-15 5.786899999999999 5.786899999999999 5.786899999999999 ZT16-19 1.0268264999999999 1.0268264999999999 1.0268264999999999 ZT20-23 0.755468 0.755468 0.755468