condition mean min max ZT0-3 28.7 28.7 28.7 ZT4-7 5.3 5.3 5.3 ZT8-11 27.5 27.5 27.5 ZT12-15 23.2 23.2 23.2 ZT16-19 26.7 26.7 26.7 ZT20-23 27.950000000000003 27.950000000000003 27.950000000000003