condition mean min max ZT0-3 10.91648 10.91648 10.91648 ZT4-7 11.7882145 11.7882145 11.7882145 ZT8-11 11.4333135 11.4333135 11.4333135 ZT12-15 9.936436 9.936436 9.936436 ZT16-19 10.536946499999999 10.536946499999999 10.536946499999999 ZT20-23 12.1462705 12.1462705 12.1462705