condition mean min max ZT0-3 36.314069 36.314069 36.314069 ZT4-7 34.521902999999995 34.521902999999995 34.521902999999995 ZT8-11 35.5989425 35.5989425 35.5989425 ZT12-15 32.4255815 32.4255815 32.4255815 ZT16-19 43.517328 43.517328 43.517328 ZT20-23 39.347494 39.347494 39.347494