condition mean min max ZT0-3 7.225524999999999 7.225524999999999 7.225524999999999 ZT4-7 8.196584999999999 8.196584999999999 8.196584999999999 ZT8-11 7.309225 7.309225 7.309225 ZT12-15 7.21957 7.21957 7.21957 ZT16-19 9.955905000000001 9.955905000000001 9.955905000000001 ZT20-23 7.283015 7.283015 7.283015