condition mean min max ZT0-3 0.26030233333333336 0.160197 0.433666 ZT4-7 0.660236 0.660236 0.660236 ZT8-11 0.49584550000000005 0.49584550000000005 0.49584550000000005 ZT12-15 0.7116135 0.689391 0.733836 ZT16-19 0.4727985 0.4727985 0.4727985 ZT20-23 0.49669149999999995 0.49669149999999995 0.49669149999999995