condition mean min max ZT0-3 42.68630537 38.912484320000004 46.460126419999995 ZT4-7 38.409390905 37.27100548 39.547776330000005 ZT8-11 39.23290733666667 38.31095109333333 40.154863580000004 ZT12-15 37.31558612166667 34.68376404666667 39.947408196666665 ZT16-19 38.55978131333333 36.59228185 40.527280776666665 ZT20-23 33.818864184999995 33.75733552 33.88039285