condition mean min max ZT0-3 3.55 3.55 3.55 ZT4-7 3.3 3.3 3.3 ZT8-11 13.25 13.25 13.25 ZT12-15 5.25 5.25 5.25 ZT16-19 3.9499999999999997 3.9499999999999997 3.9499999999999997 ZT20-23 37.45 37.45 37.45