condition mean min max ZT0-3 13.837900000000001 13.837900000000001 13.837900000000001 ZT4-7 10.7696 10.7696 10.7696 ZT8-11 10.22132 10.22132 10.22132 ZT12-15 9.032454999999999 9.032454999999999 9.032454999999999 ZT16-19 13.81545 13.81545 13.81545 ZT20-23 12.889 12.889 12.889