Table 1.
Factors associated with institutionalization (univariate and multivariate Cox regression models)
| Univariate | Multivariate | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Model 1(1) | Model 2(2) | ||||||||
| HR | (95% CI) | p | HR | (95% CI) | p | HR | (95% CI) | p | |
| Patient age (< 80 years) | 1.11 | (0.27; 4.54) | 0.882 | ||||||
| Patient sex (female) | 1.33 | (1.02; 1.73) | 0.031 | 1.45 | (1.05; 2.00) | 0.025 | 1.41 | (1.00; 2.00) | 0.052 |
| Patient studies (≥ secondary) | 1.52 | (1.26; 1.84) | 0.000 | 1.33 | (1.21; 1.47) | 0.000 | 1.60 | (1.58; 1.61) | 0.000 |
| Barthel index (independence, little or moderate dependence, > 60 points) | 1.07 | (0.74; 1.55) | 0.715 | ||||||
| GDS stage (GDS 3–5 mild-moderate dementia) | 0.85 | (0.35; 2.07) | 0.719 | ||||||
| Treatment for dementia (No) | 1.36 | (1.00; 1.84) | 0.049 | 1.43 | (1.10; 1.87) | 0.009 | |||
| Neuroleptic treatment (No) | 1.17 | (0.91; 1.50) | 0.232 | ||||||
| Charlson index (≤ 2 points) | 0.97 | (0.71; 1.33) | 0.852 | ||||||
| Caregiver's employment status (Does not work) | 1.28 | (0.38; 4.28) | 0.688 | ||||||
| Presence of caregiver overload (No) | 1.38 | (0.72; 2.65) | 0.336 | ||||||
| Apathy subsyndrome (No)(1) | 2.26 | (1.31; 3.91) | 0.004 | 2.23 | (1.29; 3.88) | 0.004 | |||
| Hyperactivity subsyndrome (No)(1) | 1.51 | (0.68; 3.40) | 0.314 | ||||||
| Affective subsyndrome (No)(1) | 0.66 | (0.27; 1.60) | 0.356 | ||||||
| Psychosis subsyndrome (No)(1) | 0.86 | (0.47; 1.60) | 0.640 | ||||||
| NPI Scale (≤ 21 points) | 1.23 | (1.16; 1.32) | 0.000 | 1.25 | (1.05; 1.49) | 0.012 | |||
In bold: p statistically significant. GDS Global Deterioration Scale (GDS 3: mild CD, borderline impairment. GDS 4: moderate CD, mild dementia. GDS 5: moderately severe CD, moderate dementia. GDS 6: severe CD, moderately severe dementia. GDS 7: very severe CD, severe dementia)
1Cox regression model adjusted for the presence of clinically relevant neuropsychiatric subsyndromes (that is, having at least some neuropsychiatric symptoms with an NPI value ≥ 4)
AIC: 321.19
BIC: 324.01
2Cox regression model adjusted for the NPI score
AIC: 325.64
BIC: 328.46