were performed using Spearman's rho to examine
relationships between grip and pinch strengths and time taken to
open the items. A correlation of 0 indicating no relationship, while a
score of 1 or 1 indicating complete correlation. According to
Cohen a small correlation is between
±.10 and ± .29, a medium correlation between ±.30 and ± .49 and a
large correlation is ±.50 and ± 1.0. Negative correlations indicated
shorter opening times and therefore better pack efficiency.