condition mean min max ZT0-3 5.701385 4.56341 6.53762 ZT4-7 0.364909 0.364909 0.364909 ZT8-11 0.946638 0.946638 0.946638 ZT12-15 2.4895680000000002 2.342355 2.636781 ZT16-19 2.529445 2.529445 2.529445 ZT20-23 1.6661445 1.6661445 1.6661445