condition mean min max ZT0-3 1.7689635 0.9205004999999999 2.20336 ZT4-7 0.7340115 0.7340115 0.7340115 ZT8-11 1.35716 1.35716 1.35716 ZT12-15 2.802175 2.3274 3.27695 ZT16-19 3.18405 3.18405 3.18405 ZT20-23 3.209205 3.209205 3.209205