condition mean min max ZT0-3 36.45 36.45 36.45 ZT4-7 27.6 27.6 27.6 ZT8-11 22.950000000000003 22.950000000000003 22.950000000000003 ZT12-15 17.5 17.5 17.5 ZT16-19 24.95 24.95 24.95 ZT20-23 28.3 28.3 28.3