The euro zone manufacturing sector purchasing managers' index fell to a seasonally adjusted 50.8 in August from 51.6 in July, according to market sources.
Economists polled had been forecasting a consensus level of 51.2.
A reading above 50 indicates the manufacturing sector is generally expanding; a reading below 50 suggests it is generally contracting.
The index is based on a questionnaire sent to purchasing executives in over 1,500 companies.
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