condition mean min max ZT0-3 518.315435 518.315435 518.315435 ZT4-7 573.700622 573.700622 573.700622 ZT8-11 693.7679264999999 693.7679264999999 693.7679264999999 ZT12-15 744.7667395000001 744.7667395000001 744.7667395000001 ZT16-19 600.1388400000001 600.1388400000001 600.1388400000001 ZT20-23 420.065444 420.065444 420.065444