condition mean min max ZT0-3 38.2068 38.2068 38.2068 ZT4-7 31.5744 31.5744 31.5744 ZT8-11 18.2388 18.2388 18.2388 ZT12-15 18.63175 18.63175 18.63175 ZT16-19 30.11515 30.11515 30.11515 ZT20-23 34.3139 34.3139 34.3139