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.
- Many people who choose standing desks also keep up a regular routine of core-strengthening exercise outside of work.
- Standing eight hours a day can bring on other complaints, such as added strain on the knees and ankles.
- The study did not record how the height of each desk compared with the height of the employee using it.
- Standing desks guarantee that no user will ever experience lower back pain.
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