condition mean min max ZT0-3 4.502785 4.43083 4.57474 ZT4-7 3.960095 3.960095 3.960095 ZT8-11 4.74084 4.74084 4.74084 ZT12-15 0 0 0 ZT16-19 5.817985 5.817985 5.817985 ZT20-23 6.0041150000000005 6.0041150000000005 6.0041150000000005