Table 3Characteristics of studies

Study CharacteristicTotal (n = 17)PCMH (n = 6)Functional PCMH (n = 11)
Study Design (studies/patients)a17/693,0286/228,28411/464,744
 RCT8/10,2842/20836/8201
 Observational9/682,7444/226,2015/456,543
Country (studies/patients)a
 United States16/692,5466/228,28410/464,262
 Canada1/4820/01/482
Comparator (studies/patients)a
 Usual care16/691,0455/226,30111/464,744
 Nonfacilitated PCMHb1/19831/19830/0
Setting/Population (studies/patients)a
 Older adults9/23,8381/15,3108/8528
 General adults3/403,3362/53361/398,000
 Children4/211,3753/207,6381/3737
 All ages (high utilizers)1/54,4790/01/54,479
Setting/Organizations (studies/patients)a
 Integrated delivery system – private8/424,0062/18,6636/405,343
 Integrated delivery system – U.S. Federal1/1600/01/160
 Independent primary care providers4/64622/18,6632/4,280
 Payer-based (e.g., Medicaid)3/261,9182/207,4391/54,479
 Canadian Healthcare System1/4820/01/482
Duration of followupc
 6-11 months2/2501/1001/150
 12 to 23 months2/69,7891/15,3101/54,479
 24 to 26 months11/411,9133/5,5358/406,378
 > 26 months1/3,7370/01/3,737
 Monthly estimates based on 4 years of data1/207,3391/207,3390/0
Overall Study Quality (studies/patients)a
 Good5/212,3781/207,3394/5039
 Fair11/480,1685/20,9456/459,223
 Poor1/4820/01/482
a

The number of patients given here represents the number of individuals presented in primary inclusion tables and/or primary analyses. Other study analyses may have included different numbers of patients.

b

In one study,60 a program of facilitated PCMH (intervention) was compared with providing practices with information on PCMH, but not facilitating the implementation (control).

c

Based on longest followup period among abstracted outcomes.

Note: PCMH = patient-centered medical home

From: Results

Cover of Closing the Quality Gap: Revisiting the State of the Science (Vol. 2: The Patient-Centered Medical Home)
Closing the Quality Gap: Revisiting the State of the Science (Vol. 2: The Patient-Centered Medical Home).
Evidence Reports/Technology Assessments, No. 208.2.
Williams JW, Jackson GL, Powers BJ, et al.

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.