Towards a validated glossary of usability attributes for the evaluation of wearable robotic devices

Table 4 Spearman rank correlations for all three ratings and professional experience variables

Coefficient (ρ)	Agreement	Relevance	Incl. design
Years of experience	− 0.20	− 0.05	− 0.02
Max. TRL	− 0.11	0.03	0.14
Nº usability studies	− 0.10	0.11	0.27
Nº users interacted	− 0.17	0.04	0.18
Coefficient (ρ)	Years exp	Max. TRL	Nº usability studies
Years of experience	N/A	0.51	0.28
Max. TRL	0.51	N/A	0.54
Nº usability studies	0.28	0.54	N/A
Nº users interacted	0.34	0.52	0.55
Coefficient (ρ)	Agreement	Relevance	Incl. design
Agreement	N/A	0.26	0.16
Relevance	0.26	N/A	0.62

Correlation coefficients are considered very strong (|ρ|> 0.7), moderate (0.7 ≤|ρ|< 0.5), fair (0.5 ≤|ρ|≤ 0.3), or poor (|ρ|< 0.3) [18]. Moderate correlations are highlighted in bold

ISSN: 1743-0003