Table 1 presents the number of medical admissions among Medicare enrollees age 66 or older with a 3-, 4-, 5- or 6-day length of stay stratified by how many different generalists submitted charges for their inpatient care. This was limited to admissions with no ICU stay and where there was a maximum of one generalist charge per day. Overall, 43.1% of admissions received care from only one generalist, with 15.7% receiving care from three or more generalists during their stay. The percentage of admissions seeing only one generalist declined substantially with increasing length of stay, from 50.1% for a 3-day stay to 30.8% for a 6-day stay.
Table 1
Number and percentage of Medical admissions receiving care from 1, 2, or 3 + generalist physicians. Results are stratified by different lengths of stay, from a 20% sample of US fee-for-service Medicare enrollees from 1/1/16 to 12/31/18. The cohort is limited to admissions with a medical Diagnostic Related Group admission, with no Intensive Care Unit stay and excluding those receiving any care from generalist physicians twice in one day. Generalist physicians include general internal medicine, family medicine or geriatrics.
Length of stay
|
Number of hospitalizations
|
Number of generalists
|
N = 1
|
N = 2
|
N = 3+
|
3 days
|
315,555
|
158,166 (50.1%)
|
127,372 (40.4%)
|
30,017 (9.5%)
|
4 days
|
202,754
|
85,037 (41.9%)
|
85,105 (42.0%)
|
32,612 (16.1%)
|
5 days
|
127,899
|
45,416 (35.5%)
|
53,717 (42.0%)
|
28,766 (22.5%)
|
6 days
|
83,209
|
25,596 (30.8%)
|
34,322 (41.2%)
|
23,291 (28.0%)
|
Total
|
729,417
|
314,215 (43.1%)
|
300,516 (41.2%)
|
114,686 (15.7%)
|
Table 2 presents the unadjusted rates of seeing just one generalist during a routine medical admission, by admission characteristics. Also shown are the odds of seeing just one generalist, adjusted for other admission characteristics and also for clustering of admissions in hospitals, in a multilevel multiple logistic regression model (Model 1 in Table 2). In both unadjusted and adjusted analyses, there was a strong relationship with length of stay, with 6-day admissions only 38% as likely as 3-day admissions to receive care from just one generalist (Odds Ratio [OR = 0.38, 95% Confidence Interval [CI] = 0.38, 0.39). Admissions from nursing facilities were less likely to see just one generalist (OR = 0.94 CI, 95% CI = 0.92, 0.96), as were admissions from the emergency room (OR = 0.77; 0.75, 0.78) or those on weekends (OR = 0.73; 0.73, 0.74). There was very little influence of other patient characteristics, with the odds of seeing only one generalist varying only minimally by age, gender, race/ethnicity, education, Medicaid eligibility or number of prior hospitalizations. We also included the DRG-Major Diagnostic Category and individual patient comorbidities in this model, and they are shown in Supplementary eTable 2. The differences in odds of receiving care from one generalist by any pre-existing comorbidity were not large. There was some variation by DRG-Major Diagnostic Category, with admissions for mental disorders and burns more likely to be cared for by just one generalist. Odds of seeing just one generalist declined from 2016 to 2018.
Table 2
Odds of receiving care from only one generalist physician. Results are for admissions aged 66 + without an Intensive Care Unit stay during hospitalization, adjusted for patient characteristics, from a two level logistic regression model (hospital and admission), among a 20% sample of US fee-for-service Medicare enrollees age ≥ 66 years, from 1/1/16 to 12/31/18.
Characteristic
|
N (%)
|
Observed rate
|
Model 1
Odds Ratio* (95% Confidence Interval)
|
Model 2
Odds Ratio* (95% Confidence Interval)
|
All
|
729,417
|
43.1%
|
|
|
Age (Per year)
|
|
|
|
|
Q1 ( > = 66; <=73)
|
188,231 (25.8%)
|
42.8%
|
Reference
|
Reference
|
Q2 ( > = 74; <=80)
|
182,726 (25.1%)
|
43.1%
|
1.00 (0.99–1.02)
|
1.00 (0.99–1.02)
|
Q3 ( > = 81; <=87)
|
189,102 (25.9%)
|
43.1%
|
1.01 (0.99–1.03)
|
1.01 (0.99–1.03)
|
Q4 ( > = 87)
|
169,358 (23.2%)
|
43.3%
|
1.03 (1.01–1.05)
|
1.03 (1.01–1.04)
|
Education (Percent of persons age 25 + in Zip area with high school education) (per percent)
|
Q1 ( < = 82.8)
|
183,360 (25.1%)
|
48.2%
|
Reference
|
Reference
|
Q2 ( > = 82.9; <=88.7)
|
182,269 (25.0%)
|
44.0%
|
0.99 (0.98–1.01)
|
0.99 (0.98–1.01)
|
Q3 ( > = 88.8; <=93.0)
|
183,500 (25.2%)
|
41.1%
|
0.97 (0.96–0.99)
|
0.98 (0.96–0.99)
|
Q4 ( > = 93.1)
|
180,288 (24.7%)
|
38.9%
|
0.98 (0.96–0.99)
|
0.98 (0.97–1.01)
|
Year
|
|
|
|
|
2016
|
239,223 (32.8%)
|
44.4%
|
Reference
|
Reference
|
2017
|
247,960 (34.0%)
|
43.1%
|
0.96 (0.95–0.97)
|
0.96 (0.95–0.97)
|
2018
|
242,234 (33.2%)
|
41.7%
|
0.91 (0.90–0.92)
|
0.91 (0.90–0.92)
|
Gender
|
|
|
|
|
Female
|
440,343 (60.4%)
|
43.5%
|
Reference
|
Reference
|
Male
|
289,074 (39.6%)
|
42.5%
|
1.01 (1.01–1.02)
|
1.01 (1.01–1.02)
|
Medicaid
|
|
|
|
|
No
|
570,166 (78.2%)
|
42.3%
|
Reference
|
Reference
|
Yes
|
159,251 (21.8%)
|
46.0%
|
1.01 (0.99–1.03)
|
1.01 (0.99–1.03)
|
Race
|
|
|
|
|
White
|
612,701 (84.0%)
|
42.3%
|
Reference
|
Reference
|
Black
|
64,030 (8.8%)
|
46.4%
|
1.03 (1.01–1.05)
|
1.03 (1.01–1.05)
|
Hispanic
|
30,267 (4.1%)
|
49.9%
|
0.99 (0.96–1.02)
|
0.99 (0.97–1.02)
|
Other
|
22,419 (3.1%)
|
45.0%
|
1.02 (0.98–1.05)
|
1.02 (0.99–1.05)
|
Residence prior to hospitalization
|
|
|
|
Community
|
667,721 (91.5%)
|
43.2%
|
Reference
|
Reference
|
Nursing facility or
other institution
|
61,696 (8.5%)
|
42.1%
|
0.94 (0.92–0.96)
|
0.94 (0.92–0.96)
|
Length of stay
|
|
|
|
|
3 days
|
315,555 (43.2%)
|
50.1%
|
Reference
|
Reference
|
4 days
|
202,754 (27.8%)
|
41.9%
|
0.68 (0.67–0.69)
|
0.68 (0.67–0.69)
|
5 days
|
127,899 (17.5%)
|
35.5%
|
0.49 (0.48–0.50)
|
0.50 (0.49–0.50)
|
6 days
|
83,209 (11.4%)
|
30.8%
|
0.38 (0.38–0.39)
|
0.39 (0.38–0.39)
|
Number of hospitalizations in 12 months before admission (per hospitalization)
|
0
|
335,465 (46.0%)
|
42.8%
|
Reference
|
Reference
|
1
|
186,403 (25.6%)
|
42.8%
|
1.01 (0.99–1.02)
|
1.01 (0.99–1.02)
|
2 and 3
|
147,014 (20.2%)
|
43.5%
|
1.03 (1.02–1.05)
|
1.03 (1.02–1.05)
|
4 and above
|
60,535 (8.3%)
|
44.3%
|
1.05 (1.02–1.07)
|
1.05 (1.02–1.07)
|
Emergency hospitalization
|
No
|
143,678 (19.7%)
|
50.0%
|
Reference
|
Reference
|
Yes
|
585,739 (80.3%)
|
41.4%
|
0.77 (0.75–0.78)
|
0.77 (0.76–0.79)
|
Weekend hospitalization
|
|
|
|
No
|
505,956 (69.4%)
|
45.2%
|
Reference
|
Reference
|
Yes
|
223,461 (30.6%)
|
38.3%
|
0.73 (0.73–0.74)
|
0.73 (0.73–0.74)
|
Bed size
|
|
|
|
|
>500
|
169,656 (23.3%)
|
39.9%
|
-
|
Reference
|
201–500
|
314,367 (43.1%)
|
40.5%
|
-
|
1.04 (0.91–1.20)
|
<=200
|
245,394 (33.6%)
|
48.6%
|
-
|
1.37 (1.19–1.58)
|
Location
|
|
|
|
|
Rural
|
138,481 (19.0%)
|
53.1%
|
-
|
Reference
|
Urban
|
590,936 (81.0%)
|
40.7%
|
-
|
0.64 (0.59–0.70)
|
Type of provider
|
|
|
|
|
For profit
|
96,302 (13.3%)
|
52.1%
|
-
|
Reference
|
Public
|
97,306 (13.3%)
|
48.3%
|
-
|
0.82 (0.74–0.92)
|
Non-profit
|
535,809 (73.4%)
|
40.5%
|
-
|
0.54 (0.49, 0.59)
|
Medical school affiliation
|
|
|
Major
|
143,993 (19.7%)
|
41.3%
|
-
|
Reference
|
Limited
|
144,656 (19.8%)
|
40.0%
|
-
|
0.80 (0.69–0.92)
|
Graduate
|
31,784 (4.4%)
|
38.1%
|
-
|
0.83 (0.66, 1.04)
|
No affiliation
|
408,984 (56.1%)
|
45.2%
|
-
|
0.96 (0.85, 1.10)
|
aOdds ratio are from multilevel model (admission and hospital) adjusted for all characteristics presented in the table, as well as the 31 Elixhauser comorbidities (each entered separately), and the Diagnosis Related Group-Major Diagnostic Category (DRG-MDC) codes. Results for the comorbidities and DRG-MDC are presented in Supplementary eTable 1. |
Model 2 in Table 2 includes specific hospital characteristics in addition to admission characteristics. Hospital characteristics associated with increased odds of continuity of care include smaller size, rural location, for-profit status and major teaching hospital. Including hospital characteristics had minimal effect on the relative lack of association of admission characteristics with the odds of receiving care from just one generalist.
We estimated the variation among hospitals in continuity of care with ICCs. The ICC for the two-level null model was 0.29, indicating that 29% of the variation in whether a hospitalized patient experiences continuity of care is explained by which hospital they are in. It was unchanged when the admission characteristics listed in Table 2 and Supplementary eTable 1 were added (that is, Model 1 of Table 2). When the hospital characteristics listed in Table 2 were added, the ICC decreased to 0.26, suggesting that about 10% of the variation among hospitals in continuity of care is explained by those hospital characteristics.
Figure 1 shows the distribution among 4,523 US hospitals of the mean rate of a patient receiving care from just one generalist, adjusted for all the admission characteristics shown in Table 2 and Supplementary eTable 1. There was substantial variation, with 26.4% of hospitals having significantly greater continuity (79.2% of admissions seeing only one generalist) and 35.2% of hospitals having significantly lower continuity (29.6% of admissions seeing only one generalist). There were also large geographic variations in continuity of care (Fig. 2). The mean adjusted rate of seeing only one hospitalist was ≤ 32% in the lowest 20% of HRRs and was ≥ 52% in the highest 20%. Rates appeared generally lower in New England, the mid-Atlantic states and the Northwest.
Table 3 presents the distributions of adjusted percent of admissions seeing only one generalist among 4,523 US hospitals in the US, stratified by hospital characteristics. In the bottom 10% of all hospitals, the adjusted percent of routine medical admissions seeing only one generalist was ≤ 24.1%, vs. > 84.1% for the top 10% of hospitals. When the hospitals were stratified by size, location, profit status or medical school affiliation, the breadth of the distributions was not largely affected (i.e., the distance between the 10th and 90th percentiles). However, larger hospitals and those with medical school affiliation had somewhat less variation than the comparison categories (Table 3). Supplementary eTable 2 presents the same analyses but limited to the 442 major teaching hospitals. There was still a large degree of variation in inpatient continuity of care when the analysis was limited to large major teaching hospitals.
Table 3
Distribution of 4,523 US hospitals, stratified by hospital characteristics. Results show the adjusted percent of routine medical admissions who received all of their general medical care from one physician.
|
N hospital
(%)
|
N admission (%)
|
Adjusted percent receiving care by one generalist*
|
Hospital type
|
|
|
Mean
|
10th
|
25th
|
50th
|
75th
|
90th
|
All hospitals
|
4,523
|
729,417 (100%)
|
52.6
|
24.1
|
34.9
|
51.5
|
69.9
|
84.1
|
Bed size
|
|
|
|
|
|
|
|
|
> 500
|
367
|
169,656 (23.3%)
|
42.3
|
21.5
|
28.3
|
42.3
|
54.1
|
64.5
|
201–500
|
1,091
|
314,367 (43.1%)
|
44.7
|
21.6
|
29.7
|
43.0
|
57.7
|
71.2
|
<=200
|
3,065
|
245,394 (33.6%)
|
57.7
|
26.9
|
39.4
|
57.4
|
77.0
|
88.9
|
Location
|
|
|
|
|
|
|
|
|
Rural
|
1,870
|
138,481 (19.0%)
|
61.7
|
30.3
|
44.3
|
63.1
|
80.4
|
91.1
|
Urban
|
2,653
|
590,936 (81.0%)
|
47.0
|
22.1
|
30.5
|
45.3
|
61.0
|
76.3
|
Type of provider
|
|
|
|
|
|
|
For profit
|
760
|
96,302 (13.3%)
|
59.8
|
29.4
|
44.0
|
59.1
|
77.6
|
88.5
|
Public
|
1,045
|
97,306 (13.3%)
|
61.3
|
28.4
|
43.6
|
63.2
|
80.8
|
90.9
|
Non-profit
|
2,718
|
535,809 (73.4%)
|
49.4
|
23.6
|
33.1
|
48.0
|
64.5
|
78.7
|
Medical school affiliation
|
|
|
|
|
|
Major
|
442
|
143,993 (19.7%)
|
45.8
|
23.3
|
31.3
|
45.5
|
58.4
|
69.2
|
Limited
|
627
|
144,656 (19.8%)
|
45.7
|
22.2
|
29.7
|
42.7
|
59.6
|
75.5
|
Graduate
|
126
|
31,784 (4.4%)
|
44.2
|
22.0
|
29.8
|
43.4
|
55.8
|
68.4
|
No affiliation
|
3,328
|
408,984 (56.1%)
|
55.3
|
25.0
|
37.0
|
54.6
|
73.9
|
87.1
|
*Adjusted for admission characteristics in a two-level logistic regression model. Admission characteristics are listed in Table 2 and Supplementary eTable 1. |