condition mean min max ZT0-3 44.25 44.25 44.25 ZT4-7 9.4 9.4 9.4 ZT8-11 55.050000000000004 55.050000000000004 55.050000000000004 ZT12-15 25.400000000000002 25.400000000000002 25.400000000000002 ZT16-19 38.800000000000004 38.800000000000004 38.800000000000004 ZT20-23 72.25 72.25 72.25