condition mean min max ZT0-3 13.095561 13.095561 13.095561 ZT4-7 17.055396000000002 17.055396000000002 17.055396000000002 ZT8-11 12.834529 12.834529 12.834529 ZT12-15 12.109595500000001 12.109595500000001 12.109595500000001 ZT16-19 12.1811475 12.1811475 12.1811475 ZT20-23 11.101277 11.101277 11.101277