medium · LSAT Logical Reasoning
A study found that people who use standing desks at work report 20% fewer instances of lower back pain than those who use traditional chairs. The researchers concluded that standing while working reduces the physical strain on the lower back.
Which of the following, if true, most seriously weakens the researchers' conclusion?
- Employees who already suffer chronic lower back pain are usually unable to tolerate the long stretches of standing that a standing desk demands.
- Core-strengthening exercise was kept up about equally often by the standing-desk users and by the traditional-chair users in the study group.
- Standing for eight hours a day can itself bring on other physical complaints, such as added strain on a worker's knees and ankles over time.
- The study never recorded how the adjustable height of each standing desk compared with the actual height of the employee assigned to use it.
- Using a standing desk flatly guarantees that no worker will ever again experience even one single recurring instance of lower back pain.
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