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Table 1 Characteristics of study sample

From: Effects of workload, work complexity, and repeated alerts on alert fatigue in a clinical decision support system

  All years 2010 2011 2012 Jan – Jun 2013
Clinicians, n 112 55 70 90 87
Nurse practitioners, n (%)* 19 (17) 6 (11) 8 (11) 12 (13) 15 (17)
Female, n (%) 71 (63) 32 (58) 44 (63) 56 (62) 54 (62)
Attested for meaningful use, n (%)† 42 (38) 33 (60) 42 (60) 42 (47) 41 (47)
Annual patients per clinician, median (Q1-Q3) 791 (406-1269) 968 (424-1336) 896 (429-1341) 758 (354-1337) 521 (391-794)
Annual encounters per clinician, median (Q1-Q3) 1357 (630-2287) 1850 (840-2416) 1695 (834-2562) 1580 (508-2389) 882 (511-1277)
Patient comorbidity score, median (Q1-Q3)‡ 0.3 (0.2-0.4) 0.3 (0.2-0.4) 0.3 (0.2-0.4) 0.4 (0.2-0.5) 0.3 (0.2-0.4)
BPAs in use, total 126 93 94 98 93
Annual BPAs received per clinician, median (Q1-Q3) 4227 (2057-6897) 5265 (2739-7652) 5075 (2602-8070) 4310 (1756-7249) 2486 (1625-3799)
Percent BPAs accepted per clinician, median (Q1-Q3) 19.4 (11.8-28.5) 18.6 (13.0-27.0) 19.6 (12.6-30.0) 20.9 (10.7-30.0) 18.6 (10.4-26.0)
DDI/DAI alerts in use, total 3213 2045 1599 1819 1364
Annual alerts received per clinician, median (Q1-Q3) 966 (407-1762) 1116 (580-2169) 1140 (547-2131) 1231 (310-1831) 622 (255-969)
Percent accepted per clinician, median (Q1-Q3) 0.0 (0.0-0.3) 0.0 (0.0-0.4) 0.0 (0.0-0.4) 0.0 (0.0-0.2) 0.0 (0.0-0.2)
  1. DDI drug-drug interaction, DAI drug-allergy interaction
  2. *All other clinicians are MDs or DOs
  3. †All of these attested during 2012
  4. ‡Comorbidity score calculated by Johns Hopkins aggregated diagnosis group algorithm