condition mean min max ZT0-3 1.5547735 0.653392 2.456155 ZT4-7 2.08435 2.08435 2.08435 ZT8-11 1.309675 1.309675 1.309675 ZT12-15 0 0 0 ZT16-19 2.054105 2.054105 2.054105 ZT20-23 1.6804899999999998 1.6804899999999998 1.6804899999999998