condition mean min max ZT0-3 2.8969675 2.66261 3.1313250000000004 ZT4-7 2.75231 2.75231 2.75231 ZT8-11 2.507135 2.507135 2.507135 ZT12-15 0 0 0 ZT16-19 2.7849399999999997 2.7849399999999997 2.7849399999999997 ZT20-23 3.2415950000000002 3.2415950000000002 3.2415950000000002