condition mean min max ZT0-3 178.9 178.9 178.9 ZT4-7 47.5 47.5 47.5 ZT8-11 86.05 86.05 86.05 ZT12-15 97.15 97.15 97.15 ZT16-19 104.6 104.6 104.6 ZT20-23 169.55 169.55 169.55