Tabla. Características demográficas y puntuaciones de las diferentes escalas (media ± desviación estándar). |
|||||
Hombres |
Mujeres |
< 68 años |
≥ 68 años |
||
Muestra (n = 40) |
18 (45%) |
22 (55%) |
20 (50%) |
20 (50%) |
|
Edad (años) |
66,9 ± 10,45 |
65 ± 17,76 |
55 ± 13 |
76 ± 6,6 |
|
FTM |
FTM |
23 ± 9,26 |
22,2 ± 13,47 |
19,5 ± 9,76 |
25,6 ± 12,77 |
FTM-A |
6,2 ± 2,83 |
8 ± 4,76 |
6,95 ± 3,17 |
7,5 ± 4,88 |
|
FTM-B |
11,5 ± 5,77 |
9,2 ± 5,38 |
8,5 ± 5,22 |
12 ± 5,54 |
|
FTM-C |
5,7 ± 3 |
5,1 ± 4,88 |
5 ± 4 |
6 ± 4,21 |
|
SF-36 |
Física |
69,8 ± 17,3 |
65,9 ± 18,8 |
69,8 ± 17,3 |
65,4 ± 21,4 |
Mental |
73,5 ± 34,6 |
64,2 ± 42,6 |
64,7 ± 39,9 |
67,8 ± 38,6 |
|
DASH |
Sin discapacidad |
41,7 ± 6,6 (15; 83,3%) |
40,1 ± 11,1 (16; 72,7%) |
38,1 ± 6,9 (14; 70%) |
43,9 ± 7,7 (17; 8%) |
Con discapacidad |
79 ± 17,2 (3; 16,7%) |
85,3 ± 14,9 (6; 27,3%) |
82,3 ± 18,1 (6; 30%) |
85 ± 10,4 (3; 15%) |
|
DASH: Disabilities of the Arm, Shoulder and Hand; FTM: Fahn-Tolosa-Marín; FTM-A: valoración de la amplitud del temblor; FTM-B: puntuación del temblor en el miembro superior en tareas de escritura, delinear y verter un líquido; FTM-C: puntuación de la incapacidad funcional por el temblor para realizar las actividades de la vida diaria; SF-36: Short Form-36 Health Survey. No se encontraron diferencias estadísticamente significativas cuando se compararon las puntuaciones de la FTM, la DASH y el SF-36 entre hombres y mujeres, y participantes < 68 o ≥ 68 años. |
Figura 1. Gráfico de sedimentación: muestra los valores propios (eigenvalues) con el análisis factorial de la escala Fahn-Tolosa-Marín.
Figura 2. Dendrogramas que muestran agrupaciones entre los diferentes ítems de la escala Fahn-Tolosa-Marín.
Figura 3. Curva ROC de la escala Fahn-Tolosa-Marín, subescala C.
Validation study of the Spanish version of the Fahn-Tolosa-Marín scale for essential tremor Introduction. The Fahn-Tolosa-Marín (FTM) tremor rating scale has been widely used in clinics for the estimation of tremor severity. However, a Spanish language version of this scale has still not been formally validated. Aim. To provide support to the validity and reliability of this version of FTM Scale. Patients and methods. A cross-sectional study was conducted on essential tremor patients. Severity was rated using the FTM scale. Upper limb disability was evaluated by terms of Disabilities of the Arm, Shoulder and Hand Scale (DASH), and to health-related quality of life using the Short Form-36 Health Survey (SF-36). Statistical analysis included sample description, reliability (Cronbach’s alpha), convergent validity, and discrimination capacity tests (ROC curves). Results. Forty patients with essential tremor (22 women, 18 men) were included, with a mean age of 65.8 ± 14.7 years (range: 21-90 years). Internal consistency of the FTM was high: Cronbach’s alpha: 0,90 (subscale A: 0.85; subscale B: 0.91; subscale C: 0.77), and the floor and ceiling effects were negligible. The FTM (subscale C) showed high correlations with DASH, and acceptable diagnostic capacity, with an area under the curve of 0.86 (95% CI: 0.67-1.00), sensitivity 78% and specificity 75% for a cut-off score > 5.5. Conclusion. The Spanish version of FTM the rating scale is a reliable and valid tool to evaluate disability in patients with essential tremor, and a suitable instrument for use in medical research, as well as in clinical practice. Key words. Clinimetric analysis. Disability. Essential tremor. Fahn-Tolosa-Marín scale. Outcomes. Rating scales. Tremor. |