condition mean min max ZT0-3 3.660015 3.00378 4.31625 ZT4-7 1.7882 1.7882 1.7882 ZT8-11 2.029295 2.029295 2.029295 ZT12-15 0 0 0 ZT16-19 4.7399949999999995 4.7399949999999995 4.7399949999999995 ZT20-23 2.75315 2.75315 2.75315