Table 2.

Correlation matrix for disease activity and impairment.

	Serum CLP	Serum NFL
Disease duration	r = 0.09, p = 0.47	r = 0.32, p = 0.006**
Disease activity status	p = 0.025*	p = 0.74
MRC sum score	r = 0.35, p = 0.013*	r = −0.42, p = 0.0008***
INCAT	r = 0.007, p = 0.95	r = 0.32, p = 0.009**
Grip strength	RIGHT ARM: r = 0.06, p = 0.673 LEFT ARM: r = 0.02, p = 0.88	RIGHT ARM: r = −0.34, p = 0.025*LEFT ARM: r = −0.46, p = 0.002**
Walking distance	r = 0.19, p = 0.167	r = −0.35, p = 0.004**

Correlation matrices of parameters of clinical disease activity and impairment of serum calprotectin (CLP) and serum neurofilament light chain (sNfl) in CIDP patients and variants. Values are Spearman r;

^* p < 0.05;

^** p < 0.01;

^***p < 0.001 or tested using Kruskal–Wallis test (disease activity status scale). MRC, medical research council sum score; INCAT, inflammatory neuropathy cause and treatment sensory sum score.