condition mean min max ZT0-3 27.6445 27.6445 27.6445 ZT4-7 34.47485 34.47485 34.47485 ZT8-11 22.97935 22.97935 22.97935 ZT12-15 18.0704 18.0704 18.0704 ZT16-19 19.39645 19.39645 19.39645 ZT20-23 24.24615 24.24615 24.24615