Table 3.
Patient characteristics and prevalence of the dependent variable in the model development and validation cohorts.
| Variable | Model development cohort, (n=290,434) | Validation cohort 1 (n=289,426) | Validation cohort 2 (n=1815) | ||||||||
| Statistic | P value | Statistic | P value | ||||||||
| Prediction date | January 1, 2014 | February 1, 2014 | N/Aa | February 1, 2014 | N/A | ||||||
| Age (years), mean (SD) | 81.3 (11.5) | 81.2 (11.5) | .20 | 79.8 (11.5) | <.001 | ||||||
| Female patients, n (%) | 234,817 (80.85) | 233,692 (80.74) | .66 | 1461 (80.50) | .91 | ||||||
| PERSb self-reported medical conditions, n (%) | |||||||||||
|
|
0 | 59,769 (20.58) | 61,685 (21.31) | <.001 | 125 (6.89) | <.001 | |||||
|
|
1-2 | 72,067 (24.81) | 71,094 (24.56) | .02 | 656 (36.14) | <.001 | |||||
|
|
3-4 | 77,739 (26.77) | 76,384 (26.39) | .27 | 519 (28.60) | .31 | |||||
|
|
≥5 | 80,859 (27.84) | 80,263 (27.73) | .25 | 515 (28.37) | .84 | |||||
| Patients with 30-day emergency hospital transport, n (%) | 6686 (2.30) | 6411 (2.22) | .08 | 40 (2.20) | .99 | ||||||
| Patients with ≥ 1 emergency encounters at 3 time points after the prediction date, n (%) | |||||||||||
|
|
30 days | N/A | N/A | N/A | 64 (3.53) | N/A | |||||
|
|
180 days | N/A | N/A | N/A | 321 (17.69) | N/A | |||||
|
|
365 days | N/A | N/A | N/A | 509 (28.04) | N/A | |||||
aN/A: not available.
bPERS: personal emergency response system.