condition mean min max ZT0-3 1.8328691115000002 0.82312331 2.8426149130000002 ZT4-7 0.49926750174999995 0.24809324649999998 0.7504417569999999 ZT8-11 1.597781688 1.1286790020000002 2.066884374 ZT12-15 3.41035280475 2.686818228 4.1338873815 ZT16-19 1.80960231375 1.8008402934999999 1.818364334 ZT20-23 2.48760231475 2.036754627 2.9384500024999998