condition mean min max ZT0-3 1031.462826 1031.462826 1031.462826 ZT4-7 674.0222934999999 674.0222934999999 674.0222934999999 ZT8-11 660.3937495 660.3937495 660.3937495 ZT12-15 652.993031 652.993031 652.993031 ZT16-19 796.932734 796.932734 796.932734 ZT20-23 1036.2010195 1036.2010195 1036.2010195