condition mean min max ZT0-3 8.48610359275 6.920745459 10.0514617265 ZT4-7 4.12648843875 3.5614205539999997 4.6915563234999995 ZT8-11 2.96407188425 2.6070448075000003 3.321098961 ZT12-15 2.6814415865 2.3694804665 2.9934027064999995 ZT16-19 6.219746648999999 5.1375381854999995 7.3019551125 ZT20-23 10.736877822499999 8.067425584999999 13.40633006