condition mean min max ZT0-3 4.91192 4.91192 4.91192 ZT4-7 4.399425 4.399425 4.399425 ZT8-11 4.9270700000000005 4.9270700000000005 4.9270700000000005 ZT12-15 5.232889999999999 5.232889999999999 5.232889999999999 ZT16-19 5.71237 5.71237 5.71237 ZT20-23 4.41739 4.41739 4.41739