condition mean min max ZT0-3 16.692517 16.692517 16.692517 ZT4-7 14.606099 14.606099 14.606099 ZT8-11 13.108414499999999 13.108414499999999 13.108414499999999 ZT12-15 16.1791135 16.1791135 16.1791135 ZT16-19 15.434442 15.434442 15.434442 ZT20-23 18.1740725 18.1740725 18.1740725