condition mean min max ZT0-3 16.8249 16.8249 16.8249 ZT4-7 6.75338 6.75338 6.75338 ZT8-11 0.579062 0.579062 0.579062 ZT12-15 6.08084 6.08084 6.08084 ZT16-19 12.36757 12.36757 12.36757 ZT20-23 27.08445 27.08445 27.08445