condition mean min max ZT0-3 121.25 121.25 121.25 ZT4-7 98.1 98.1 98.1 ZT8-11 63.5 63.5 63.5 ZT12-15 72.6 72.6 72.6 ZT16-19 126.94999999999999 126.94999999999999 126.94999999999999 ZT20-23 147.5 147.5 147.5