condition mean min max ZT0-3 27.315 27.315 27.315 ZT4-7 19.95525 19.95525 19.95525 ZT8-11 10.964300000000001 10.964300000000001 10.964300000000001 ZT12-15 8.45953 8.45953 8.45953 ZT16-19 19.426650000000002 19.426650000000002 19.426650000000002 ZT20-23 24.5499 24.5499 24.5499