condition mean min max ZT0-3 5.46569 5.46569 5.46569 ZT4-7 3.783 3.783 3.783 ZT8-11 6.176634999999999 6.176634999999999 6.176634999999999 ZT12-15 6.91301 6.91301 6.91301 ZT16-19 7.565295000000001 7.565295000000001 7.565295000000001 ZT20-23 6.0638749999999995 6.0638749999999995 6.0638749999999995