condition mean min max ZT0-3 7.01985 7.01985 7.01985 ZT4-7 6.405725 6.405725 6.405725 ZT8-11 7.41821 7.41821 7.41821 ZT12-15 7.256835000000001 7.256835000000001 7.256835000000001 ZT16-19 10.3655 10.3655 10.3655 ZT20-23 8.625875 8.625875 8.625875