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Panel A: prevalence of moderate‐to‐severe psychological distress (NHIS). Panel B: prevalence of low‐back pain (NHIS). Panel C: proportion of medical visits with LBP as primary reason (combined NAMCS and NHAMCS). Panel D: prevalence of health insurance (NHIS). All panels show January 1998 through December 2004 with 95% confidence intervals [Colour figure can be viewed at wileyonlinelibrary.com]
