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Table 1 Demographics of the study population in total and by cohort

From: Multi-psychotropic drug prescription and the association to neuropsychiatric symptoms in three Norwegian nursing home cohorts between 2004 and 2011

  Total 2004 2007 2011 P-value
N = 4739 N = 1137 N = 1879 N = 1723
Age, mean (SD) a,b 85.7 (7.0) 85.0 (6.5) 85.9 (7.1) 85.9 (7.1) 0.03
Women, N (%) 3383 (71) 836 (74) 1321 (70) 1226 (71) NS
Regular drugs without psychotropics, mean (SD)a, b,c 5.2 (2.9) 4.7 (2.8) 5.1 (2.9) 5.7 (3.0) <0.001
Dementia (CDR), N (%)      <0.001
 No 497 (11) 37 (3) 406 (22) 54 (3)  
 Questionable 388 (8) 183 (16) 0 (0) 205 (12)  
 Mild 686 (15) 225 (20) 163 (9) 298 (18)  
 Moderate 1336 (28) 306 (27) 529 (28) 501 (30)  
 Severe 1786 (38) 382 (34) 768 (41) 636 (38)  
Dependency, mean (SD)b,d 18.1 (5.4) 18.0 (5.3) 18.5 (5.5) 17.7 (5.3) <0.001
NPI-NH total score, mean (SD) 17.5 (18.7) 18.5 (19.2) 16.1 (17.6) 18.5 (17.6) 0.03
  1. ANOVA for continuous and X 2 for categorical data
  2. NPI-NH neuropsychiatric inventory – nursing home version, SD standard deviation, NS not significant
  3. CDR Clinical Dementia Rating scale 1 to 3, asignificant between 2004 and 2007, bsignificant between 2004 and 2011, csignificant between 2007 and 2011, dhigher scores indicates more dependency in daily living