condition mean min max ZT0-3 0.48413883333333335 0.4087675 0.5839335 ZT4-7 1.892865 1.892865 1.892865 ZT8-11 1.542185 1.542185 1.542185 ZT12-15 1.7025925000000002 1.32345 2.081735 ZT16-19 2.22638 2.22638 2.22638 ZT20-23 1.8324150000000001 1.8324150000000001 1.8324150000000001