condition mean min max ZT0-3 13.640374999999999 13.51175 13.768999999999998 ZT4-7 16.400299999999998 16.400299999999998 16.400299999999998 ZT8-11 24.51075 24.51075 24.51075 ZT12-15 0 0 0 ZT16-19 18.2343 18.2343 18.2343 ZT20-23 15.39535 15.39535 15.39535