OMAHA, Neb. — A monthly survey of business supply managers shows improvement but still reflects relatively weak economic conditions in nine Midwest and Plains states, according to a report issued Thursday.

The Mid-America Business Conditions Index report said the overall economic index for the region rose to 46.5 in November from 43.8 in October.

“Weakness among manufacturers linked to agriculture, energy and international markets continue to weigh on regional economic conditions,” said Creighton University economist Ernie Goss, who oversees the survey. “Despite the decline in manufacturing, the nonmanufacturing sector of the regional economy is expanding, albeit at a slow pace,” he said.

The survey results are compiled into a collection of indexes ranging from zero to 100. Survey organizers say any score above 50 suggests growth in that factor. A score below that suggests decline. The survey covers Arkansas, Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, Oklahoma and South Dakota.

The region’s manufacturing sector continued to lose jobs, as the job index for November declined to 41.9 last month from October’s 44.4.