condition mean min max ZT0-3 37.614885 37.614885 37.614885 ZT4-7 16.740778 16.740778 16.740778 ZT8-11 16.198815 16.198815 16.198815 ZT12-15 20.2302545 20.2302545 20.2302545 ZT16-19 13.465263 13.465263 13.465263 ZT20-23 15.706637999999998 15.706637999999998 15.706637999999998