condition mean min max ZT0-3 0.28445866666666664 0.156896 0.461194 ZT4-7 0.34465049999999997 0.34465049999999997 0.34465049999999997 ZT8-11 0.3865325 0.3865325 0.3865325 ZT12-15 0.3954685 0.33696000000000004 0.45397699999999996 ZT16-19 0.27993599999999996 0.27993599999999996 0.27993599999999996 ZT20-23 0.3145635 0.3145635 0.3145635