condition mean min max ZT0-3 34.65 34.65 34.65 ZT4-7 35.8 35.8 35.8 ZT8-11 28.950000000000003 28.950000000000003 28.950000000000003 ZT12-15 19.25 19.25 19.25 ZT16-19 21.3 21.3 21.3 ZT20-23 23.85 23.85 23.85