condition mean min max ZT0-3 35.1856 35.1856 35.1856 ZT4-7 29.05755 29.05755 29.05755 ZT8-11 24.75175 24.75175 24.75175 ZT12-15 28.5038 28.5038 28.5038 ZT16-19 35.39915 35.39915 35.39915 ZT20-23 34.061499999999995 34.061499999999995 34.061499999999995