Table 3.

Agreement between Research Measurement and Bedside Nurse Measurement of the Richmond Agitation-Sedation Scale (RASS) Within Two Hours of Each Other

Patient Characteristic	N	Weighted Kappa (95% CI)
All Matched Assessments	6731	0.66 (0.64, 0.68)
Unit-Specific Assessments
Medical	3612	0.71 (0.67, 0.75)
Surgical	3119	0.60 (0.55, 0.63)
Medical Subgroups
Patients Mechanically Ventilated	4747	0.60 (0.56, 0.62)
Cognitively Impaired at Baseline*	850	0.70 (0.66, 0.77)
History of Depression	2611	0.65 (0.61, 0.70)
APACHE† Acute Physiology Score, Quintile (Score)
Quartile 1 (<12)	1295	0.64 (0.57, 0.68)
Quartile 2 (12–15)	1295	0.64 (0.57, 0.68)
Quartile 3 (16–20)	1891	0.64 (0.60, 0.68)
Quartile 4 (21 or greater)	2052	0.69 (0.65, 0.73)
Age Groups
< 65	4450	0.69 (0.66, 0.72)
≥ 65	2281	0.58 (0.54, 0.63)
Year of Data Collection
2007	1733	0.67 (0.61, 0.71)
2008	1903	0.65 (0.59, 0.70)
2009	2240	0.65 (0.61, 0.68)
2010	855	0.66 (0.60, 0.71)

^*Cognitively impaired is defined as an IQCODE score of > 3.3

^†APACHE: Acute Physiology and Chronic Health Evaluation