condition mean min max ZT0-3 1.258837 1.258837 1.258837 ZT4-7 0.6486354999999999 0.6486354999999999 0.6486354999999999 ZT8-11 0.9563595 0.9563595 0.9563595 ZT12-15 4.495430000000001 4.495430000000001 4.495430000000001 ZT16-19 7.593859999999999 7.593859999999999 7.593859999999999 ZT20-23 4.45322 4.45322 4.45322