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Approximately 80% of the adult US population will experience low back pain at sometime in their lives. This statement is supported by research performed by NIH:

Low back pain continues to be a significant public health problem. Seventy to 85% of all people have back pain at some time in life, with the annual prevalence of back pain ranging from 15-45%. Back pain is the most frequent cause of activity limitation in people below 45 years and is a common reason for visiting a health care provider. Symptoms are most common in middle-aged adults, with back pain equally common in men and women; however, back pain secondary to disc disorders is more common in men. Reported rates of low back pain are generally higher for Whites than Blacks or other racial groups. 1