condition mean min max ZT0-3 0.5564715 0.31985250000000004 0.7765455 ZT4-7 1.93485 1.93485 1.93485 ZT8-11 1.044649 1.044649 1.044649 ZT12-15 2.3510205 0.6621360000000001 4.039905 ZT16-19 0.69774 0.69774 0.69774 ZT20-23 0.6958355 0.6958355 0.6958355