condition mean min max ZT0-3 0.232617 0.232617 0.232617 ZT4-7 0.32907699999999995 0.32907699999999995 0.32907699999999995 ZT8-11 0.044822650000000006 0.044822650000000006 0.044822650000000006 ZT12-15 0.070204 0.070204 0.070204 ZT16-19 0.536828 0.536828 0.536828 ZT20-23 0.5944375 0.5944375 0.5944375