condition mean min max ZT0-3 508.65000000000003 508.65000000000003 508.65000000000003 ZT4-7 657.0 657.0 657.0 ZT8-11 568.9000000000001 568.9000000000001 568.9000000000001 ZT12-15 579.95 579.95 579.95 ZT16-19 505.4 505.4 505.4 ZT20-23 516.75 516.75 516.75