Table 7: Relation between myotonia and pain in DM1

	Myotonia
	None (N=2)	Mild (N = 8)	Severe (N = 11)	p
Intensity of pain in the previous week 1	2,5 (±3,5)	39,4 (±30,8)	34 (±31,3)	0,325
Current pain1	1 (50,0%)	5 (62,5%)	5 (45,5%)	0,760
Level of pain (1 - no pain, 10 - the worst possible pain)1
Worst pain in the last 24 hours	1,0	3,6 (±2,7)	3,5 (±2,9)	0,478
Least pain in the last 24 hours	1,0	2,3 (±1,8)	2,3 (±2,3)	0,707
Average pain in the last 24 hours	1,0	2,8 (±2,4)	3,1 (±2,4)	0,521
Pain at the moment	1,0	3,0 (±3,0)	2,5 (±2,1)	0,587

¹The variables are described in terms of average (± SD); difference between groups tested by ANOVA.

²The variable is described in terms of absolute and relative frequencies; difference between groups tested by chi-square test of maximum likelihood.