condition mean min max ZT0-3 435.95000000000005 435.95000000000005 435.95000000000005 ZT4-7 467.3 467.3 467.3 ZT8-11 538.1 538.1 538.1 ZT12-15 804.4 804.4 804.4 ZT16-19 919.2 919.2 919.2 ZT20-23 652.2 652.2 652.2