condition mean min max ZT0-3 31.067075000000003 30.07585 32.0583 ZT4-7 28.7648 28.7648 28.7648 ZT8-11 19.2192 19.2192 19.2192 ZT12-15 0 0 0 ZT16-19 22.539 22.539 22.539 ZT20-23 27.34915 27.34915 27.34915