condition mean min max ZT0-3 18.352897499999997 1.511295 35.1945 ZT4-7 31.767300000000002 31.767300000000002 31.767300000000002 ZT8-11 24.2636 24.2636 24.2636 ZT12-15 6.8766175 1.72494 12.028295 ZT16-19 1.1344596666666666 0.8212593333333333 1.44766 ZT20-23 0 0 0