condition mean min max ZT0-3 13.985025 13.985025 13.985025 ZT4-7 13.8119905 13.8119905 13.8119905 ZT8-11 11.613110500000001 11.613110500000001 11.613110500000001 ZT12-15 12.7286265 12.7286265 12.7286265 ZT16-19 12.4790375 12.4790375 12.4790375 ZT20-23 11.802480500000001 11.802480500000001 11.802480500000001