condition mean min max ZT0-3 0.38309725000000006 0.26734800000000003 0.4988465 ZT4-7 0.9250055 0.9250055 0.9250055 ZT8-11 2.095045 2.095045 2.095045 ZT12-15 0 0 0 ZT16-19 1.0805395 1.0805395 1.0805395 ZT20-23 0.9978115000000001 0.9978115000000001 0.9978115000000001