condition mean min max ZT0-3 37.685050000000004 36.5056 38.8645 ZT4-7 35.084900000000005 35.084900000000005 35.084900000000005 ZT8-11 29.42225 29.42225 29.42225 ZT12-15 0 0 0 ZT16-19 43.92359999999999 43.92359999999999 43.92359999999999 ZT20-23 48.20625 48.20625 48.20625