condition mean min max ZT0-3 5.793716666666667 4.713369999999999 6.590205 ZT4-7 5.5099149999999995 5.5099149999999995 5.5099149999999995 ZT8-11 4.05945 4.05945 4.05945 ZT12-15 3.80412 3.76159 3.8466500000000003 ZT16-19 3.495015 3.495015 3.495015 ZT20-23 5.475115000000001 5.475115000000001 5.475115000000001