condition mean min max ZT0-3 571.317457 571.317457 571.317457 ZT4-7 397.1699965 397.1699965 397.1699965 ZT8-11 412.1290795 412.1290795 412.1290795 ZT12-15 494.8650785 494.8650785 494.8650785 ZT16-19 646.1044245 646.1044245 646.1044245 ZT20-23 665.583576 665.583576 665.583576