condition mean min max ZT0-3 35.95491666666667 19.5217 46.00395 ZT4-7 19.481749999999998 19.481749999999998 19.481749999999998 ZT8-11 23.1553 23.1553 23.1553 ZT12-15 37.128924999999995 33.3244 40.93345 ZT16-19 39.38505 39.38505 39.38505 ZT20-23 47.468999999999994 47.468999999999994 47.468999999999994