condition mean min max ZT0-3 35.5506 35.5506 35.5506 ZT4-7 40.70155 40.70155 40.70155 ZT8-11 34.4681 34.4681 34.4681 ZT12-15 25.5356 25.5356 25.5356 ZT16-19 32.72855 32.72855 32.72855 ZT20-23 33.8785 33.8785 33.8785