condition mean min max ZT0-3 0.798855 0.798855 0.798855 ZT4-7 1.111825 1.111825 1.111825 ZT8-11 1.206435 1.206435 1.206435 ZT12-15 0.0 0.0 0.0 ZT16-19 0.961595 0.961595 0.961595 ZT20-23 1.437157 1.437157 1.437157