condition mean min max ZT0-3 422.5 422.5 422.5 ZT4-7 538.0 538.0 538.0 ZT8-11 490.95 490.95 490.95 ZT12-15 449.70000000000005 449.70000000000005 449.70000000000005 ZT16-19 456.0 456.0 456.0 ZT20-23 465.7 465.7 465.7