condition mean min max ZT0-3 231.85000000000002 231.85000000000002 231.85000000000002 ZT4-7 165.6 165.6 165.6 ZT8-11 168.89999999999998 168.89999999999998 168.89999999999998 ZT12-15 167.05 167.05 167.05 ZT16-19 154.25 154.25 154.25 ZT20-23 217.2 217.2 217.2