condition mean min max ZT0-3 10.066947500000001 9.883195 10.2507 ZT4-7 7.561154999999999 7.561154999999999 7.561154999999999 ZT8-11 7.15876 7.15876 7.15876 ZT12-15 0 0 0 ZT16-19 8.191105 8.191105 8.191105 ZT20-23 9.121765 9.121765 9.121765