condition mean min max ZT0-3 0.8232425 0.8232425 0.8232425 ZT4-7 0.2938345 0.2938345 0.2938345 ZT8-11 0.0710365 0.0710365 0.0710365 ZT12-15 1.3140450000000001 1.3140450000000001 1.3140450000000001 ZT16-19 7.663245 7.663245 7.663245 ZT20-23 2.51477 2.51477 2.51477