condition mean min max ZT0-3 24.950000000000003 24.950000000000003 24.950000000000003 ZT4-7 14.4 14.4 14.4 ZT8-11 23.25 23.25 23.25 ZT12-15 18.95 18.95 18.95 ZT16-19 26.8 26.8 26.8 ZT20-23 42.5 42.5 42.5