condition mean min max ZT0-3 1.3986075 1.174315 1.6229 ZT4-7 0.8370705 0.8370705 0.8370705 ZT8-11 0.738899 0.738899 0.738899 ZT12-15 0 0 0 ZT16-19 2.604725 2.604725 2.604725 ZT20-23 0.42962350000000005 0.42962350000000005 0.42962350000000005