condition mean min max ZT0-3 129.35 129.35 129.35 ZT4-7 274.2 274.2 274.2 ZT8-11 520.4 520.4 520.4 ZT12-15 362.05 362.05 362.05 ZT16-19 209.5 209.5 209.5 ZT20-23 270.75 270.75 270.75