condition mean min max ZT0-3 0.78609675 0.192455 1.3797385 ZT4-7 1.1784124999999999 1.1784124999999999 1.1784124999999999 ZT8-11 0.4010785 0.4010785 0.4010785 ZT12-15 0 0 0 ZT16-19 1.5501649999999998 1.5501649999999998 1.5501649999999998 ZT20-23 1.36308 1.36308 1.36308