condition mean min max ZT0-3 185.613286 185.613286 185.613286 ZT4-7 86.4105665 86.4105665 86.4105665 ZT8-11 85.515526 85.515526 85.515526 ZT12-15 139.50006050000002 139.50006050000002 139.50006050000002 ZT16-19 243.0974415 243.0974415 243.0974415 ZT20-23 423.23028450000004 423.23028450000004 423.23028450000004