98 PART THREE | DELIRIUM Total n=574 % No delirium n=522 % Delirium n=52 % P= Odds Ratio 95% confidence interval OR Predisposing factors Age >70 No 452 79 421 81 31 60 Yes 122 21 101 19 21 40 <.001* 2.824 1.557-5.119 Alcohol/drug abuse No 526 92 480 92 46 89 Yes 48 8 42 8 6 12 .43 1.491 .602-3.693 Hearing difficulty No 556 97 508 97 48 92 Yes 18 3 14 3 4 8 .07 3.024 .958-9.549 Visual impairment No 559 97 511 98 48 92 Yes 15 3 11 2 4 8 .04 3.871 1.187-12.624 History of delirium No 569 99 517 99 52 100 Yes 5 1 5 1 0 0 .99 - - Cognitive impairment No 562 98 514 99 48 92 Yes 12 2 8 2 4 8 .02 5.354 1.555-18.431 Precipitating factors High doses of psychotropic medication No 428 75 397 76 31 60 Yes 146 25 125 24 21 40 .01 2.151 1.193-3.878 Corticosteroids 43 7 43 8 0 0 .03 - - Sedatives 29 5 22 4 7 14 .01 3.535 1.432-8.727 Opioids 86 15 70 13 16 31 .002* 2.870 1.513-5.445 Table 4. Prevalence of predisposing and precipitating factors * P<0.01
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