In a Kendall’s tau-b correlation analysis investigating the relationship between the age of the populations (excluding the unspecified category) and their representation in the publications included in this review, a strong and nearly statistically significant positive correlation was observed, τ b = 0.545 , p = 0.061 . 3.3 Robots used Concerning the robots used in the studies, NAO, Pepper ( Pandey and Gelin, 2018 ), QTRobot and Jibo are the most commonly employed and represent respectively 14.3%, 10%, 5.7% and 2.9% of the publications ( Figure 6A ).
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