condition mean min max ZT0-3 23.351725000000002 22.292 24.411450000000002 ZT4-7 27.93375 27.93375 27.93375 ZT8-11 29.06955 29.06955 29.06955 ZT12-15 0 0 0 ZT16-19 34.757999999999996 34.757999999999996 34.757999999999996 ZT20-23 29.2414 29.2414 29.2414