condition mean min max ZT0-3 29.45 29.45 29.45 ZT4-7 14.9 14.9 14.9 ZT8-11 12.950000000000001 12.950000000000001 12.950000000000001 ZT12-15 23.599999999999998 23.599999999999998 23.599999999999998 ZT16-19 9.85 9.85 9.85 ZT20-23 24.05 24.05 24.05