condition mean min max ZT0-3 621.75 621.75 621.75 ZT4-7 667.9 667.9 667.9 ZT8-11 696.6 696.6 696.6 ZT12-15 595.35 595.35 595.35 ZT16-19 525.4000000000001 525.4000000000001 525.4000000000001 ZT20-23 567.85 567.85 567.85