Development and validation of the scale for symptom clusters in patients with myasthenia gravis

BMC Neurology

Table 2 Factors, items and factor loadings of The MG-SC (N = 283)

Symptom clusters	symptom	Factor loadings
Symptom clusters	symptom	1	2	3	4
Ocular muscle weakness	ptosis	0.148	0.139	0.102	0.828
	diplopia	0.228	0.177	0.179	0.741
Generalized muscle weakness	masticatory atonia	0.819	0.105	0.092	0.239
	slurred speech	0.764	0.133	0.030	0.264
	dysphagia	0.876	0.115	0.125	0.158
	sensation of foreign body in pharynx	0.794	0.149	0.061	0.163
	hoarseness	0.729	0.206	-0.007	0.153
	head up in difficulty	0.793	0.191	0.152	0.109
	Upper limb weakness	0.758	0.213	0.164	0.059
	Lower limb weakness	0.730	0.230	0.223	0.012
	dyspnea	0.787	0.177	0.240	0.024
	weak cough	0.802	0.222	0.181	0.056
	chest tightness	0.660	0.396	0.305	-0.076
Treatment-related side effects	Weight change	0.247	0.223	0.810	0.125
	moon-face	0.190	0.128	0.854	0.185
Psychological disorders	anxiety	0.243	0.814	0.142	0.141
	depression	0.172	0.864	0.076	0.114
	sleep disorder	0.246	0.652	0.193	0.008
	stigma	0.171	0.748	0.048	0.182
Eigenvalue		6.967	2.988	1.804	1.577
Percentage of variance		36.668	15.725	9.494	8.3

Abbreviation: MG-SC = The Symptom Cluster scale for patients with myasthenia gravis

ISSN: 1471-2377