condition mean min max ZT0-3 75.983916 75.983916 75.983916 ZT4-7 75.26777949999999 75.26777949999999 75.26777949999999 ZT8-11 73.6667005 73.6667005 73.6667005 ZT12-15 90.988942 90.988942 90.988942 ZT16-19 122.25580049999999 122.25580049999999 122.25580049999999 ZT20-23 134.8628665 134.8628665 134.8628665