condition mean min max ZT0-3 1.5362873333333333 0.643752 2.061275 ZT4-7 0.6080585000000001 0.6080585000000001 0.6080585000000001 ZT8-11 1.940775 1.940775 1.940775 ZT12-15 2.5013425 2.08345 2.919235 ZT16-19 1.9228 1.9228 1.9228 ZT20-23 2.627415 2.627415 2.627415