condition mean min max ZT0-3 12.395906360000001 11.326991880000001 13.46482084 ZT4-7 10.340559494499999 8.711187274 11.969931715 ZT8-11 10.347346830500001 10.3101076915 10.3845859695 ZT12-15 9.541815051499999 9.274079744 9.809550359 ZT16-19 13.0045735625 10.74434741 15.264799714999999 ZT20-23 27.818046595 24.383178 31.25291519