condition mean min max ZT0-3 4.2837233333333335 3.7743 4.539225 ZT4-7 2.24338 2.24338 2.24338 ZT8-11 2.06783 2.06783 2.06783 ZT12-15 2.719825 2.38748 3.0521700000000003 ZT16-19 4.54728 4.54728 4.54728 ZT20-23 4.8740000000000006 4.8740000000000006 4.8740000000000006