condition mean min max ZT0-3 2268.1 2268.1 2268.1 ZT4-7 1550.5 1550.5 1550.5 ZT8-11 1598.8000000000002 1598.8000000000002 1598.8000000000002 ZT12-15 1650.05 1650.05 1650.05 ZT16-19 2373.4 2373.4 2373.4 ZT20-23 2431.6 2431.6 2431.6