Table 3

Association of baseline variables with anxiety

	STAI-Y113			GBS questionnaire total score
Variable	Correlation	95% CI	p	Correlation	95% CI	p
Age (years)	−0.06	−0.25 to 0.13	0.51	−0.10	−0.28 to 0.09	0.32
Male gender	−0.38	−0.59 to −0.17	0.0004	−0.23	−0.44 to −0.01	0.040
GBS onset to admission	−0.09	−0.28 to 0.10	0.34	−0.002	−0.19 to 0.18	0.98
Disability grade*	0.22	0.03 to 0.39	0.022	0.16	−0.03 to 0.34	0.095
Arm grade†	0.20	0.01 to 0.37	0.036	0.23	0.05 to 0.40	0.015
Bulbar dysfunction	0.29	0.06 to 0.52	0.012	0.26	0.04 to 0.49	0.022
Inability to lift head	−0.17	−0.17 to 0.21	0.85	−0.09	−0.31 to 0.12	0.39
Vital capacity‡	0.02	−0.17 to 0.21	0.85	0.01	−0.18 to 0.20	0.89

Results are Spearman or Somers’ Dxy rank correlation coefficients for quantitative and binary variables, respectively.
*Disability grade: 0, healthy, no signs or symptoms; 1, minor symptoms or signs and able to run; 2, able to walk 5 m across an open space without assistance; 3, able to walk 5 m across an open space with the help of one person and a waist-level walking-frame; 4, chairbound/bedbound: unable to walk as in 3; 5, requires assisted ventilation and 6, dead.15
†Arm grade: 0, normal; 1, minor symptoms or signs but able to put hand on top of head when sitting with head upright and able to oppose the thumb to each fingertip; 2, able to do either of the tasks in 1 but not both; 3, some movements but unable to perform either of the tasks in 2; 4, no movement and 5, dead.15
‡Expressed as % of predicted value.
GBS, Guillain-Barré syndrome; VA, visual analogical scale.