condition mean min max ZT0-3 1.1715909905 0.645894639 1.6972873419999999 ZT4-7 1.587382493 1.3319505525 1.8428144335 ZT8-11 1.62923334375 1.6136202845 1.6448464029999998 ZT12-15 2.43947392 1.8414967375 3.0374511025000004 ZT16-19 2.05155735575 1.6268241479999999 2.4762905635 ZT20-23 3.62221990475 3.2567392075 3.9877006020000003