condition mean min max ZT0-3 61.650000000000006 61.650000000000006 61.650000000000006 ZT4-7 7.2 7.2 7.2 ZT8-11 32.199999999999996 32.199999999999996 32.199999999999996 ZT12-15 58.550000000000004 58.550000000000004 58.550000000000004 ZT16-19 38.75 38.75 38.75 ZT20-23 52.55 52.55 52.55