condition mean min max ZT0-3 24.55 24.55 24.55 ZT4-7 3.0 3.0 3.0 ZT8-11 3.4499999999999997 3.4499999999999997 3.4499999999999997 ZT12-15 4.5 4.5 4.5 ZT16-19 25.5 25.5 25.5 ZT20-23 38.6 38.6 38.6