condition mean min max ZT0-3 14.735199999999999 14.735199999999999 14.735199999999999 ZT4-7 9.258849999999999 9.258849999999999 9.258849999999999 ZT8-11 15.451550000000001 15.451550000000001 15.451550000000001 ZT12-15 12.37085 12.37085 12.37085 ZT16-19 23.07855 23.07855 23.07855 ZT20-23 16.3304 16.3304 16.3304