Usual
source of care was measured in the National
Health Interview Survey (NHIS):
In 1993 and 1994 by asking
the respondent,
‘‘Is there a particular person or place that ____usually goes
to when ____is sick or needs advice about ___health?’’
In the 1995 and 1996 NHIS,
the respondent was asked, ‘‘Is there one
doctor, person, or place that ____usually goes to when ____is sick or
needs advice about ____health?’’
Starting in 1997 the
respondent was
asked, ‘‘Is there a place that ____usually goes when he/she is sick or
you need advice about (his/her) health?’’