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Methods| The NHIS is an annual survey conducted by the National Center for Health Statistics about health and health care use. The 2012 NHIS contains responses from 108 131 individuals in 42 366 households, of whom 34 525 adults completed the Sample Adult component and the Adult Alternative Medicine supplement. Our sample consists of 7493 civilian, noninstitutionalized US adults 18 years and older who completed the CAM supplement and indicated having used CAM during the past 12 months and having a personal primary care physician. Respondents were asked whether they told their physician about using the CAM modality identified as most important to their health during the previous year. Those who did not were asked whether their nondisclosure was due to one of the following:(1) belief that their physician did not need to know about their CAM use,(2) past discouragement of CAM use by their …