condition mean min max ZT0-3 0.425155 0.425155 0.425155 ZT4-7 0.1679485 0.1679485 0.1679485 ZT8-11 0.29666899999999996 0.29666899999999996 0.29666899999999996 ZT12-15 0.29909949999999996 0.29909949999999996 0.29909949999999996 ZT16-19 0.39316266666666666 0.39316266666666666 0.39316266666666666 ZT20-23 0.268479 0.268479 0.268479