condition mean min max ZT0-3 345.580557775 281.3105786 409.85053695 ZT4-7 194.67966810000001 175.5689588 213.7903774 ZT8-11 171.12188865 156.06909389999998 186.1746834 ZT12-15 137.48356724833334 134.69121986333334 140.27591463333334 ZT16-19 161.0908531 149.00966406666666 173.17204213333332 ZT20-23 190.49673038333333 167.89146716666667 213.10199360000001