condition mean min max ZT0-3 715.948661 715.948661 715.948661 ZT4-7 1667.4051335 1667.4051335 1667.4051335 ZT8-11 2184.8769780000002 2184.8769780000002 2184.8769780000002 ZT12-15 2043.4105295 2043.4105295 2043.4105295 ZT16-19 1732.057695 1732.057695 1732.057695 ZT20-23 1489.9914045 1489.9914045 1489.9914045