condition mean min max ZT0-3 5.23361526225 5.225372807499999 5.241857717 ZT4-7 2.95174980625 2.651860702 3.2516389105 ZT8-11 2.7035527705 2.3649321785 3.0421733625000003 ZT12-15 2.97563002875 2.938578476 3.0126815815 ZT16-19 4.141755717000001 3.374941266 4.908570168000001 ZT20-23 8.409424413 6.789278499 10.029570327