condition mean min max ZT0-3 0.7153257725 0.565125961 0.865525584 ZT4-7 2.4048903082499997 2.1064265045 2.703354112 ZT8-11 4.32454593 3.6546067415 4.9944851185 ZT12-15 7.362194629749999 6.7769198809999995 7.947469378499999 ZT16-19 6.8240543460000005 6.4758190085 7.1722896835 ZT20-23 9.51877566625 9.057445231500001 9.980106101