condition mean min max ZT0-3 456.45000000000005 456.45000000000005 456.45000000000005 ZT4-7 662.0 662.0 662.0 ZT8-11 914.0999999999999 914.0999999999999 914.0999999999999 ZT12-15 925.3 925.3 925.3 ZT16-19 861.85 861.85 861.85 ZT20-23 642.35 642.35 642.35