condition mean min max ZT0-3 3.0199 3.0199 3.0199 ZT4-7 1.4817399999999998 1.4817399999999998 1.4817399999999998 ZT8-11 1.9309749999999999 1.9309749999999999 1.9309749999999999 ZT12-15 3.368015 3.368015 3.368015 ZT16-19 4.949906666666667 4.949906666666667 4.949906666666667 ZT20-23 0.0 0.0 0.0