condition mean min max ZT0-3 62.1149191 60.85356361 63.37627459 ZT4-7 60.128750755 59.15425117 61.10325034 ZT8-11 81.46029137 75.03894485000001 87.88163789 ZT12-15 80.5219424725 69.11132727500001 91.93255767 ZT16-19 69.1659774325 56.24662067 82.085334195 ZT20-23 43.464868945 34.891477105 52.038260785