condition mean min max ZT0-3 340.775863 340.775863 340.775863 ZT4-7 279.995717 279.995717 279.995717 ZT8-11 259.085779 259.085779 259.085779 ZT12-15 276.3235295 276.3235295 276.3235295 ZT16-19 357.4072445 357.4072445 357.4072445 ZT20-23 481.9523 481.9523 481.9523