condition mean min max ZT0-3 5.476694999999999 5.476694999999999 5.476694999999999 ZT4-7 5.85386 5.85386 5.85386 ZT8-11 5.0666899999999995 5.0666899999999995 5.0666899999999995 ZT12-15 2.7965999999999998 2.7965999999999998 2.7965999999999998 ZT16-19 5.27629 5.27629 5.27629 ZT20-23 4.796805 4.796805 4.796805