condition mean min max ZT0-3 405.477388 405.477388 405.477388 ZT4-7 330.0034435 330.0034435 330.0034435 ZT8-11 405.3055785 405.3055785 405.3055785 ZT12-15 486.904909 486.904909 486.904909 ZT16-19 497.66091 497.66091 497.66091 ZT20-23 527.4105915 527.4105915 527.4105915