condition mean min max ZT0-3 5.2243472637499995 4.868038918 5.5806556095 ZT4-7 6.1478197935 6.021269834 6.274369753 ZT8-11 6.10555252175 5.788722599 6.4223824445 ZT12-15 9.02499016 7.9258679125 10.1241124075 ZT16-19 14.68145548275 11.1236277655 18.2392832 ZT20-23 36.605931065 26.72635315 46.48550898