condition mean min max ZT0-3 4.96696 4.96696 4.96696 ZT4-7 0.63197 0.63197 0.63197 ZT8-11 4.9556450000000005 4.9556450000000005 4.9556450000000005 ZT12-15 4.160325 4.160325 4.160325 ZT16-19 7.699484999999999 7.699484999999999 7.699484999999999 ZT20-23 5.458805 5.458805 5.458805