condition mean min max ZT0-3 26.058258 26.058258 26.058258 ZT4-7 66.477609 66.477609 66.477609 ZT8-11 68.1416905 68.1416905 68.1416905 ZT12-15 55.4860175 55.4860175 55.4860175 ZT16-19 38.444327 38.444327 38.444327 ZT20-23 40.521902 40.521902 40.521902