condition mean min max ZT0-3 1.382545 1.051655 1.799165 ZT4-7 0.628856 0.628856 0.628856 ZT8-11 1.7673050000000001 1.7673050000000001 1.7673050000000001 ZT12-15 1.5650849999999998 1.423865 1.706305 ZT16-19 0.9836415000000001 0.9836415000000001 0.9836415000000001 ZT20-23 1.89643 1.89643 1.89643