condition mean min max ZT0-3 595.0 595.0 595.0 ZT4-7 520.3 520.3 520.3 ZT8-11 439.9 439.9 439.9 ZT12-15 415.15 415.15 415.15 ZT16-19 504.04999999999995 504.04999999999995 504.04999999999995 ZT20-23 478.75 478.75 478.75