condition mean min max ZT0-3 1.357699 1.33327 1.382128 ZT4-7 0.4796895 0.4796895 0.4796895 ZT8-11 0.7082835 0.7082835 0.7082835 ZT12-15 0 0 0 ZT16-19 0.686979 0.686979 0.686979 ZT20-23 0.6706190000000001 0.6706190000000001 0.6706190000000001