condition mean min max ZT0-3 0.687315 0.4824 0.8359595 ZT4-7 0.443915 0.443915 0.443915 ZT8-11 0.4307975 0.4307975 0.4307975 ZT12-15 1.9301375 1.8994900000000001 1.960785 ZT16-19 2.0966899999999997 2.0966899999999997 2.0966899999999997 ZT20-23 1.849785 1.849785 1.849785