condition mean min max ZT0-3 81.55000000000001 81.55000000000001 81.55000000000001 ZT4-7 129.7 129.7 129.7 ZT8-11 53.15 53.15 53.15 ZT12-15 58.8 58.8 58.8 ZT16-19 78.35 78.35 78.35 ZT20-23 58.0 58.0 58.0