Table 4.

Comparison of mean scores per format for entire sample on scale of 0–3 (difference, significance value, effect size).

Variable compared	Percentage	Proportion-word	Proportion notation	Pie chart	Mix
Mean (SD)	2.37 (0.92)	1.92 (1.20)	1.88 (1.28)	2.70 (0.78)	1.29 (1.00)
Verbal label	>	>	>	<	>
	p = .530	p = .001*	p < .001*	p = .005	p < .001*
	r = .06	r = .34	r = .35	r = -.27	r = .63
Percentage		>	>	>	>
		p = .005	p = .002*	p < 001*	p < .001*
		r = .27	r = .30	r = -.34	r = .59
Proportion – word			>	<	>
			p = .610	p < .001*	p < .001*
			r = .05	r = .53	r = .48
Proportion – notation				<	>
				p < .001*	p < .001*
				r = -.50	r = .41
Pie chart					>
					p = .001*
					r = .72

* Significant at p =< .003 level (Bonferroni correction)