condition mean min max ZT0-3 106.32541132 91.70381364 120.94700900000001 ZT4-7 68.83957222250001 62.19893734 75.480207105 ZT8-11 27.110940192500003 19.766177595 34.455702790000004 ZT12-15 14.119096313250001 12.9471339165 15.291058710000001 ZT16-19 30.771793359999997 22.58285401 38.960732709999995 ZT20-23 60.313043555 53.33753684 67.28855027