condition mean min max ZT0-3 291.85 291.85 291.85 ZT4-7 543.4 543.4 543.4 ZT8-11 468.70000000000005 468.70000000000005 468.70000000000005 ZT12-15 403.25 403.25 403.25 ZT16-19 264.6 264.6 264.6 ZT20-23 239.75 239.75 239.75