condition mean min max ZT0-3 6.98810774775 2.579259303 11.3969561925 ZT4-7 17.412447649999997 15.877070555 18.947824745 ZT8-11 10.672953861 9.134038453 12.211869269000001 ZT12-15 2.69695685175 1.9621541315 3.4317595720000003 ZT16-19 1.3859690642499998 1.1605001654999998 1.611437963 ZT20-23 0.93583497225 0.680587093 1.1910828515