This is pure speculation, but I could see several scenarios that might produce the discrepancy: America's fear of regulation results in more workers being inju

This is pure speculation, but I could see several scenarios that might produce the discrepancy: America's fear of regulation results in more workers being injured and developing chronic pain. America's broken healthcare system means that people are less likely to have access to alternatives such as physical therapy, meditation, counseling, etc. America's weak social safety net means that people have to relieve their pain so that they can continue working. Cultural factors result in people being less accepting of pain as part of their lives.