condition mean min max ZT0-3 561.677771 561.677771 561.677771 ZT4-7 445.4180045 445.4180045 445.4180045 ZT8-11 482.429709 482.429709 482.429709 ZT12-15 619.2389814999999 619.2389814999999 619.2389814999999 ZT16-19 718.5733765 718.5733765 718.5733765 ZT20-23 702.0514185 702.0514185 702.0514185