condition mean min max ZT0-3 38.6 38.6 38.6 ZT4-7 16.1 16.1 16.1 ZT8-11 3.8499999999999996 3.8499999999999996 3.8499999999999996 ZT12-15 25.05 25.05 25.05 ZT16-19 55.8 55.8 55.8 ZT20-23 72.15 72.15 72.15