condition mean min max ZT0-3 9.477995 9.477995 9.477995 ZT4-7 10.2281265 10.2281265 10.2281265 ZT8-11 10.027794499999999 10.027794499999999 10.027794499999999 ZT12-15 8.5130795 8.5130795 8.5130795 ZT16-19 9.563690000000001 9.563690000000001 9.563690000000001 ZT20-23 9.317146000000001 9.317146000000001 9.317146000000001