condition mean min max ZT0-3 0.35821749999999997 0.334756 0.381679 ZT4-7 2.67058 2.67058 2.67058 ZT8-11 3.8908949999999995 3.8908949999999995 3.8908949999999995 ZT12-15 0 0 0 ZT16-19 1.43781 1.43781 1.43781 ZT20-23 2.124235 2.124235 2.124235