condition mean min max ZT0-3 0.2859465 0.2859465 0.2859465 ZT4-7 1.5888045000000002 1.5888045000000002 1.5888045000000002 ZT8-11 0.322437 0.322437 0.322437 ZT12-15 0.0 0.0 0.0 ZT16-19 0.3491735 0.3491735 0.3491735 ZT20-23 1.885205 1.885205 1.885205