condition mean min max ZT0-3 630.0 630.0 630.0 ZT4-7 445.4 445.4 445.4 ZT8-11 534.5 534.5 534.5 ZT12-15 500.3 500.3 500.3 ZT16-19 575.5 575.5 575.5 ZT20-23 637.25 637.25 637.25