condition mean min max ZT0-3 0.7444573333333333 0.492047 0.954982 ZT4-7 0.592019 0.592019 0.592019 ZT8-11 0.462387 0.462387 0.462387 ZT12-15 0.077019 0.0 0.154038 ZT16-19 0.47355250000000004 0.47355250000000004 0.47355250000000004 ZT20-23 0.64917 0.64917 0.64917