condition mean min max ZT0-3 4.5953599999999994 4.29662 4.8941 ZT4-7 5.87034 5.87034 5.87034 ZT8-11 4.351275 4.351275 4.351275 ZT12-15 0 0 0 ZT16-19 6.0352250000000005 6.0352250000000005 6.0352250000000005 ZT20-23 5.7385850000000005 5.7385850000000005 5.7385850000000005