condition mean min max ZT0-3 16.336599999999997 16.2045 16.4687 ZT4-7 16.5882 16.5882 16.5882 ZT8-11 26.79175 26.79175 26.79175 ZT12-15 0 0 0 ZT16-19 29.80425 29.80425 29.80425 ZT20-23 23.6461 23.6461 23.6461