condition mean min max ZT0-3 89.3 89.3 89.3 ZT4-7 13.3 13.3 13.3 ZT8-11 45.0 45.0 45.0 ZT12-15 70.19999999999999 70.19999999999999 70.19999999999999 ZT16-19 81.75 81.75 81.75 ZT20-23 75.5 75.5 75.5