condition mean min max ZT0-3 4.4346250000000005 3.5535050000000004 5.08138 ZT4-7 3.77499 3.77499 3.77499 ZT8-11 2.5233049999999997 2.5233049999999997 2.5233049999999997 ZT12-15 2.8658675000000002 2.557855 3.17388 ZT16-19 3.05832 3.05832 3.05832 ZT20-23 4.744735 4.744735 4.744735