condition mean min max ZT0-3 18.04855 18.04855 18.04855 ZT4-7 24.3890825 24.3890825 24.3890825 ZT8-11 27.541536 27.541536 27.541536 ZT12-15 35.648024500000005 35.648024500000005 35.648024500000005 ZT16-19 35.08582 35.08582 35.08582 ZT20-23 25.607072000000002 25.607072000000002 25.607072000000002