condition mean min max ZT0-3 10.635543333333333 9.54812 12.45375 ZT4-7 10.83425 10.83425 10.83425 ZT8-11 11.02585 11.02585 11.02585 ZT12-15 13.530650000000001 13.01675 14.044550000000001 ZT16-19 9.178855 9.178855 9.178855 ZT20-23 9.409600000000001 9.409600000000001 9.409600000000001