condition mean min max ZT0-3 8.35323364375 8.0376731145 8.668794173 ZT4-7 10.8881165875 9.672241425000001 12.10399175 ZT8-11 9.7804425485 8.962882079333333 10.598003017666667 ZT12-15 11.3154488595 8.905657649 13.72524007 ZT16-19 9.632941918499998 9.382661808333333 9.883222028666665 ZT20-23 8.445800254666667 8.1887579 8.702842609333333