condition mean min max ZT0-3 0.581088 0.35198799999999997 0.97889 ZT4-7 2.240615 2.240615 2.240615 ZT8-11 1.402545 1.402545 1.402545 ZT12-15 3.22377 3.1746 3.27294 ZT16-19 1.328135 1.328135 1.328135 ZT20-23 0.891494 0.891494 0.891494