condition mean min max ZT0-3 9.8 9.8 9.8 ZT4-7 3.9 3.9 3.9 ZT8-11 20.950000000000003 20.950000000000003 20.950000000000003 ZT12-15 14.95 14.95 14.95 ZT16-19 28.8 28.8 28.8 ZT20-23 9.6 9.6 9.6