condition mean min max ZT0-3 9.975340000000001 9.331330000000001 10.61935 ZT4-7 8.343195 8.343195 8.343195 ZT8-11 8.252345 8.252345 8.252345 ZT12-15 0 0 0 ZT16-19 11.268 11.268 11.268 ZT20-23 10.338799999999999 10.338799999999999 10.338799999999999