condition mean min max ZT0-3 166.277577 166.277577 166.277577 ZT4-7 133.689806 133.689806 133.689806 ZT8-11 162.2934925 162.2934925 162.2934925 ZT12-15 188.0804355 188.0804355 188.0804355 ZT16-19 181.3691035 181.3691035 181.3691035 ZT20-23 171.64619449999998 171.64619449999998 171.64619449999998