condition mean min max ZT0-3 4.65 4.65 4.65 ZT4-7 5.0 5.0 5.0 ZT8-11 3.75 3.75 3.75 ZT12-15 3.6999999999999997 3.6999999999999997 3.6999999999999997 ZT16-19 5.4 5.4 5.4 ZT20-23 5.05 5.05 5.05