The basic sampling unit for the NAMCS
is the physician-patient encounter or outpatient visit.
First, nonresponse to an invitation to participate in NAMCS
might have resulted in underestimation or overestimation of HIV testing, given that response rates ranged from 39% to 62% of health care providers contacted for participation.
, like the two other ambulatory care surveys reviewed, is a cross-sectional survey that collects data at the patient encounter level.
Estimates from the 1996 NHAMCS and the 1996 NAMCS
were obtained from public data sets available from the NCHS web site (NCHS 2004d).
The first-stage sample contains the same 112 geographic primary sampling units as NAMCS
We used the typical NAMCS
protocol of collecting data on every second patient presenting for medical care during the study period.
The other specialties covered by NAMCS
included internal medicine, 1 general/family practice, obstetrics and gynecology, pediatrics, cardiology, oncology, and neurology.
315 patient years, 1997-1999; and from the United States: NAMCS
data have both advantages and disadvantages as tools for studying the determinants of mental health diagnosis and treatment in primary care.
is designed and conducted by the National Center for Health Statistics, Centers for Disease Control and Prevention; data are collected by the US Bureau of the Census.
was a probability sample of ambulatory clinicians across the United States.
We compared these data with patient visits reported in the 1990 NAMCS
for FPs and GPs.