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Table 2 Patient characteristics: Comparison of HMO insured patients vs. other HMO insured patients (All sample and the admission subset)

From: The impact of EHR and HIE on reducing avoidable admissions: controlling main differential diagnoses

Characteristics The main HMO Other HMOs Total study sample
Data on all referrals (Admissions and Discharges) – All Sample
Number of Referrals n = 210,568 n = 71,182 n = 281,750
Age (years) 48.6 (Quartiles: 27.6, 51.6, 69.9) 39.2 (Quartiles: 20.5, 36.5, 55.7) 46.3 (Quartiles: 25.4, 47.8, 67.3)
Male (%) 99,951 (47.5%) 35,683 (50.1%) 135,634 (48.1%)
Referrals when EHR IS Viewed (%) 68,851 (32.7%) 18,991 (26.7%) 87,842 (31.2%)
Referrals when EHR IS Viewed [Divided by Interoperability] Local: 58,468 (27.8%) Local: 17,197 (24.2%) [Local: 75,665 (26.9%)
External: 10,383 (4.9%) External: 1,794 (2.5%)] External: 12,177 (4.3%)]
Admissions (%) 89,473 (42.5%) 26,246 (36.9%) 115,719 (41.1%)
Additional Data Only on the Admissions' subset
Number of Admissions n = 89,473 n = 26,246 n = 115,719
Admissions When EHR IS Was Viewed (% from All admissions) 34,313 (38.4%) 8,717 (33.2%) 43,030 (37.2%)
Admissions When EHR IS Was Not Viewed (% from All Admissions) 55,160 (61.6%) 17,529 (66.8%) 72,689 (62.8%)
Readmission within seven Days (% from Admissions) 2,830 (3.2%) 911 (3.5%) 3,741 (3.2%)
Readmission within 30 Days (% from Admissions) 6,802 (7.6%) 1,823 (6.95%) 8,625 (7.45%)
Single-Day Admissions (% from Admissions) 18,449 (20.6%) 6,859 (26.1%) 25,308 (21.9%)
Admission Period (days) 4.4 (Quartiles: 2, 3, 5) 3.8 (Quartiles: 2, 3, 4) 4.3 (Quartiles: 2, 3, 5)
  1. Data are mean (and Quartiles) or number of subjects (proportion); all univariate comparisons were significant at 0.001. Percentages at each column relate to the column itself (the 100% for each column appears in the first line labelled "Number of Referrals" for the 'Data On all Referrals' part in the Table, and "Number of Admissions" for the 'Additional Data Only on the Admissions' subset' part of the Table).