condition mean min max ZT0-3 1.7021000000000002 1.55323 1.85097 ZT4-7 3.5106450000000002 3.5106450000000002 3.5106450000000002 ZT8-11 3.0357149999999997 3.0357149999999997 3.0357149999999997 ZT12-15 0 0 0 ZT16-19 1.61272 1.61272 1.61272 ZT20-23 2.3661450000000004 2.3661450000000004 2.3661450000000004