condition mean min max ZT0-3 42.579689 42.579689 42.579689 ZT4-7 49.939499 49.939499 49.939499 ZT8-11 56.266816000000006 56.266816000000006 56.266816000000006 ZT12-15 62.575711999999996 62.575711999999996 62.575711999999996 ZT16-19 24.189943 24.189943 24.189943 ZT20-23 22.2280145 22.2280145 22.2280145