condition mean min max ZT0-3 1.0663828333333334 0.927281 1.27799 ZT4-7 0.479297 0.479297 0.479297 ZT8-11 0.331961 0.331961 0.331961 ZT12-15 0.6640685 0.5532125 0.7749245 ZT16-19 0.949085 0.949085 0.949085 ZT20-23 0.7552185 0.7552185 0.7552185