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the officials in charge of the checks, in accordance with the enumerator guidelines and other objective facts, correlated the data both within questionnaires and with the data contained in the questionnaires for other households in the same region in order to verify that the answers given were correct.
referenceperioder: for at begrænse stikprøvefejlene og eventuelle vanskeligheder med at huske de relevante detaljer blev der anvendt forskellige referenceperioder under undersøgelsen.