condition mean min max ZT0-3 1.4726648507500002 1.2843507915 1.66097891 ZT4-7 0.88442570325 0.472477598 1.2963738085 ZT8-11 16.97289226675 5.4542236995 28.491560834 ZT12-15 56.341106657500006 47.363089315 65.319124 ZT16-19 60.669769135 47.444998325 73.894539945 ZT20-23 33.5978566625 27.80251857 39.393194754999996