condition mean min max ZT0-3 56.250183 56.250183 56.250183 ZT4-7 71.05964449999999 71.05964449999999 71.05964449999999 ZT8-11 76.7587145 76.7587145 76.7587145 ZT12-15 82.67498950000001 82.67498950000001 82.67498950000001 ZT16-19 88.4275545 88.4275545 88.4275545 ZT20-23 83.939175 83.939175 83.939175