Overkill of surveys may have serious consequences, officials warn.

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A Swedish Radio news survey said Tuesday that Swedes are tired of surveys and questionnaires. Less than 80 percent reply to surveys, which is 10 percent fewer than a decade ago.

The overkill of surveys carried out every week by state institutions, schools, hospitals and business can have serious consequences, Sweden’s state statistics office -- that surveys almost 30,000 people every month -- warned. National official figures, such as unemployment rate, get less reliable when fewer respond.