condition mean min max ZT0-3 23.573525 23.28785 23.8592 ZT4-7 24.3328 24.3328 24.3328 ZT8-11 27.21875 27.21875 27.21875 ZT12-15 0 0 0 ZT16-19 31.2804 31.2804 31.2804 ZT20-23 25.92735 25.92735 25.92735