condition mean min max ZT0-3 43.88515 39.3091 48.461200000000005 ZT4-7 19.798299999999998 19.798299999999998 19.798299999999998 ZT8-11 25.91065 25.91065 25.91065 ZT12-15 0 0 0 ZT16-19 30.83245 30.83245 30.83245 ZT20-23 37.57225 37.57225 37.57225