condition mean min max ZT0-3 2443.6 2443.6 2443.6 ZT4-7 1817.0 1817.0 1817.0 ZT8-11 1940.3 1940.3 1940.3 ZT12-15 1612.8 1612.8 1612.8 ZT16-19 1574.5500000000002 1574.5500000000002 1574.5500000000002 ZT20-23 1989.5 1989.5 1989.5