condition mean min max ZT0-3 1.4190957425 0.983700469 1.8544910159999999 ZT4-7 1.7614699630000001 1.1084696605 2.4144702655000003 ZT8-11 0.95781536375 0.709660569 1.2059701585 ZT12-15 0.44506216725 0.310277665 0.5798466695 ZT16-19 0.425177361 0.241380444 0.6089742779999999 ZT20-23 1.8165747630000002 1.6813504525 1.9517990735000001