Table 3 Relationship effect measures.

	Brainfog	Headache	Chronic fatigue	Over-stimulation	Dyspnea	Palpitations	Muscle pain	Muscle weakness	Bell score
Brainfog
Headache	Rho = 0.48 p < 0.001***
Chronic fatigue	Rho = 0.53 p < 0.001***	Rho = 0.32 p = 0.008**
Over-stimulation	Rho = 0.70 p < 0.001***	Rho = 0.39 p < 0.001***	Rho = 0.67 p < 0.001***
Dyspnoea	Rho = 0.25 p = 0.052	Rho = 0.15 p = 0.261	Rho = 0.42 p < 0.001***	Rho = 0.37 p = 0.003**
Palpitations	Rho = 0.38 p = 0.002**	Rho = 0.32 p = 0.011*	Rho = 0.49 p < 0.001***	Rho = 0.41 p < 0.001***	Rho = 0.42 p < 0.001***
Muscle pain	Rho = 0.29 p = 0.023*	Rho = 0.28 p = 0.028*	Rho = 0.37 p = 0.003**	Rho = 0.34 p = 0.007**	Rho = 0.13 p = 0.357	Rho = 0.39 p = 0.003**
Muscle weakness	Rho = 0.46 p < 0.001***	Rho = 0.38 p = 0.003**	Rho = 0.49 p < 0.001***	Rho = 0.40 p < 0.001***	Rho = 0.42 p = 0.001**	Rho = 0.33 p = 0.010**	Rho = 0.51 p < 0.001***
Bell scores	Rho = 0.60 p < 0.001***	Rho = 0.42 p < 0.001***	Rho = 0.72 p < 0.001***	Rho = 0.68 p < 0.001***	Rho = 0.40 p = 0.003**	Rho = 0.47 p < 0.001***	Rho = 0.39 p = 0.003**	Rho = 0.56 p < 0.001***
Open question	Rho = 0.53 p < 0.001***	Rho = 0.16 p = 0.194	Rho = 0.63 p < 0.001***	Rho = 0.55 p < 0.001***	Rho = 0.31 p = 0.016*	Rho = 0.30 p = 0.013*	Rho = 0.43 p < 0.001***	Rho = 0.49 p < 0.001***	Rho = 0.69 p < 0.001***

Relationship between the three effect measures (Spearman’s Rho), where the number of stars reflects the significance level: *p < 0.05, **p < 0.01, ***p < 0.001.

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