condition mean min max ZT0-3 9.08273 3.354095 14.38065 ZT4-7 2.5398050000000003 2.5398050000000003 2.5398050000000003 ZT8-11 2.37563 2.37563 2.37563 ZT12-15 8.639209999999999 7.55054 9.727879999999999 ZT16-19 10.543099999999999 10.543099999999999 10.543099999999999 ZT20-23 14.189900000000002 14.189900000000002 14.189900000000002