condition mean min max ZT0-3 19.59928841 13.59539339 25.60318343 ZT4-7 11.3225732895 10.470482614 12.174663965 ZT8-11 11.928241700000001 10.67852208 13.177961320000001 ZT12-15 10.4410468695 9.992932113 10.889161626 ZT16-19 7.538262051000001 6.754482703500001 8.322041398500001 ZT20-23 11.028805083 9.892577901 12.165032265