condition mean min max ZT0-3 30.871000000000002 28.44225 33.29975 ZT4-7 22.6572 22.6572 22.6572 ZT8-11 21.9312 21.9312 21.9312 ZT12-15 0 0 0 ZT16-19 27.504649999999998 27.504649999999998 27.504649999999998 ZT20-23 29.230150000000002 29.230150000000002 29.230150000000002