condition mean min max ZT0-3 60.048092 60.048092 60.048092 ZT4-7 58.307812999999996 58.307812999999996 58.307812999999996 ZT8-11 61.089151 61.089151 61.089151 ZT12-15 63.222806000000006 63.222806000000006 63.222806000000006 ZT16-19 56.798415500000004 56.798415500000004 56.798415500000004 ZT20-23 54.9593665 54.9593665 54.9593665