condition mean min max ZT0-3 0.6561171666666666 0.5436805 0.7770269999999999 ZT4-7 0.78099 0.78099 0.78099 ZT8-11 2.48893 2.48893 2.48893 ZT12-15 10.3529175 9.085085 11.620750000000001 ZT16-19 3.9590199999999998 3.9590199999999998 3.9590199999999998 ZT20-23 1.9895800000000001 1.9895800000000001 1.9895800000000001