condition mean min max ZT0-3 11.39279 11.39279 11.39279 ZT4-7 10.896993 10.896993 10.896993 ZT8-11 10.148292000000001 10.148292000000001 10.148292000000001 ZT12-15 14.125855999999999 14.125855999999999 14.125855999999999 ZT16-19 12.0570275 12.0570275 12.0570275 ZT20-23 11.1968815 11.1968815 11.1968815