Background: The environment in which medicine is practiced has changed
in the past 2 decades, but little information has been available on h
ow the day-to-day practice of primary care for children has changed du
ring this period. Objective: To identify aspects of primary care pract
ices for children that are undergoing substantial changes. Design: Ana
lysis of National Ambulatory Medical Care Surveys from 1979 to 1981, 1
985, and 1989 to 1994. Participants: Primary care practitioners record
ed data on 58 488 child visits.Main Outcome Measures: Characteristics
and insurance status of children, physician activities during visits,
and disposition after visit. Results: Child visits to primary care phy
sicians increased by 22% between 1979 and 1994. The mean age of childr
en visiting primary care physicians decreased from 6.7 years in 1979 t
o 5.7 years in 1994 (P for trend, <.001). The ethnic diversity of chil
d visits increased primarily as a result of an increasing proportion o
f visits by Hispanic (6.0% in 1979 to 12.6% in 1994, P for trend, <.00
1) and Asian patients (1.6% in 1979 to 4.1% in 1994, P for trend, <.00
1). Medicaid and managed care increased dramatically as sources of pay
ment. Changes in physician activities included an increase in some pre
ventive services, changes in the most commonly encountered medications
, and an increased mean duration of patient visits (11.8 minutes in 19
79 to 14.2 minutes in 1994, P for trend, <.001). Conclusions: These da
ta may assist in the development of educational and research initiativ
es for physicians caring for children. The declining proportion of ado
lescent visits may present physicians with challenges in the care of a
dolescents. Physician prescribing practices showed changes without evi
dence of a benefit to child health. The increased ethnic diversity and
provision of preventive services were associated with an increased me
an duration of primary care visits. The increased duration of child vi
sits may conflict with the managed care emphasis on physician producti
vity.