condition mean min max ZT0-3 0.59246378175 0.23256401100000001 0.9523635525 ZT4-7 1.52405134425 1.3160212625 1.7320814260000001 ZT8-11 1.11967028725 1.0153322144999999 1.22400836 ZT12-15 1.6340709305 1.1213695394999998 2.1467723215000003 ZT16-19 2.34083694575 1.9752371960000001 2.7064366955 ZT20-23 6.35507411275 4.787381605 7.9227666205