condition mean min max ZT0-3 16.666775 16.42355 16.91 ZT4-7 16.952350000000003 16.952350000000003 16.952350000000003 ZT8-11 16.72765 16.72765 16.72765 ZT12-15 0 0 0 ZT16-19 19.416 19.416 19.416 ZT20-23 17.3836 17.3836 17.3836