condition mean min max ZT0-3 71.33427499999999 71.2024 71.46615 ZT4-7 77.5418 77.5418 77.5418 ZT8-11 70.9774 70.9774 70.9774 ZT12-15 0 0 0 ZT16-19 78.07294999999999 78.07294999999999 78.07294999999999 ZT20-23 77.9423 77.9423 77.9423