condition mean min max ZT0-3 31.75 31.75 31.75 ZT4-7 34.5 34.5 34.5 ZT8-11 36.55 36.55 36.55 ZT12-15 27.7 27.7 27.7 ZT16-19 55.150000000000006 55.150000000000006 55.150000000000006 ZT20-23 19.650000000000002 19.650000000000002 19.650000000000002