condition mean min max ZT0-3 13.242862 13.242862 13.242862 ZT4-7 13.106234500000001 13.106234500000001 13.106234500000001 ZT8-11 9.197220000000002 9.197220000000002 9.197220000000002 ZT12-15 10.579895 10.579895 10.579895 ZT16-19 9.846218499999999 9.846218499999999 9.846218499999999 ZT20-23 9.405475 9.405475 9.405475