More than two-thirds of Amazon.com Inc. US warehouse workers surveyed by researchers reported that they took unpaid time off to recover from pain or exhaustion sustained on the job.

The new national study, published Wednesday by the University of Illinois Chicago’s Center for Urban Economic Development, found that 69% of workers surveyed stayed home without pay to recover, including 34% who did so three or more times.

The data suggest “injury and pain at Amazon are

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