condition mean min max ZT0-3 1.65502 1.23956 2.01855 ZT4-7 1.04617 1.04617 1.04617 ZT8-11 1.066938 1.066938 1.066938 ZT12-15 2.579965 2.11688 3.04305 ZT16-19 1.82812 1.82812 1.82812 ZT20-23 3.036495 3.036495 3.036495