condition mean min max ZT0-3 1435.122604 1435.122604 1435.122604 ZT4-7 991.2889270000001 991.2889270000001 991.2889270000001 ZT8-11 943.9598445 943.9598445 943.9598445 ZT12-15 1348.053385 1348.053385 1348.053385 ZT16-19 1057.5703035000001 1057.5703035000001 1057.5703035000001 ZT20-23 903.4626609999999 903.4626609999999 903.4626609999999