condition mean min max ZT0-3 11.10895 11.10895 11.10895 ZT4-7 6.69082 6.69082 6.69082 ZT8-11 8.103929999999998 8.103929999999998 8.103929999999998 ZT12-15 17.96215 17.96215 17.96215 ZT16-19 23.45685 23.45685 23.45685 ZT20-23 14.64835 14.64835 14.64835