condition mean min max ZT0-3 429.882588 429.882588 429.882588 ZT4-7 492.18253500000003 492.18253500000003 492.18253500000003 ZT8-11 564.2402475 564.2402475 564.2402475 ZT12-15 613.3035345 613.3035345 613.3035345 ZT16-19 549.6784765 549.6784765 549.6784765 ZT20-23 590.660901 590.660901 590.660901