condition mean min max ZT0-3 60.481874385 20.53081018 100.43293858999999 ZT4-7 144.653990325 139.72140025 149.5865804 ZT8-11 74.567592535 57.88993884 91.24524623 ZT12-15 12.5606257765 7.208410375500001 17.9128411775 ZT16-19 14.52436874 13.444337914999998 15.604399565000001 ZT20-23 13.6271609905 11.231986526 16.022335455