condition mean min max ZT0-3 33.85986666666667 28.5809 38.05285 ZT4-7 24.59565 24.59565 24.59565 ZT8-11 28.6797 28.6797 28.6797 ZT12-15 39.649825 36.7934 42.50625 ZT16-19 46.988749999999996 46.988749999999996 46.988749999999996 ZT20-23 44.7342 44.7342 44.7342