condition mean min max ZT0-3 1.6132724999999999 1.19161 2.034935 ZT4-7 0.829001 0.829001 0.829001 ZT8-11 1.653875 1.653875 1.653875 ZT12-15 0 0 0 ZT16-19 2.66737 2.66737 2.66737 ZT20-23 1.042535 1.042535 1.042535