condition mean min max ZT0-3 11.58025 11.58025 11.58025 ZT4-7 15.464849999999998 15.464849999999998 15.464849999999998 ZT8-11 7.530535 7.530535 7.530535 ZT12-15 5.875565 5.875565 5.875565 ZT16-19 6.06099 6.06099 6.06099 ZT20-23 6.297965 6.297965 6.297965