condition mean min max ZT0-3 2.45 2.45 2.45 ZT4-7 1.4 1.4 1.4 ZT8-11 8.1 8.1 8.1 ZT12-15 1.8 1.8 1.8 ZT16-19 2.3 2.3 2.3 ZT20-23 2.9499999999999997 2.9499999999999997 2.9499999999999997