Table 4.

Demographics and self-rated statistical skills of participants. Notes: *‘Compared to others at your level of education in your participant, how good do you think your understanding of basic statistics is?’; rated on scale from 0 (very poor) to 100 (excellent). **‘How confident are you in interpreting the results of a t-test?’ rated from 1 = very confident to 4 = Very little idea of what a t-test is. ***‘How familiar are you with the idea of statistical power?’ rated from 1 = very familiar to 4 = very little idea about what statistical power is'.

	sample 1	sample 2
	(N = 50)	(N = 50)
sex
female	34 (68.0%)	40 (80.0%)
male	16 (32.0%)	9 (18.0%)
other	0 (0%)	1 (2.0%)
age band
18–24	27 (54.0%)	34 (68.0%)
25–30	11 (22.0%)	6 (12.0%)
31–40	10 (20.0%)	6 (12.0%)
41–50	2 (4.0%)	4 (8.0%)
Educational level
pre-degree	5 (10.0%)	3 (6.0%)
1st degree	33 (66.0%)	28 (56.0%)
masters	7 (14.0%)	15 (30.0%)
doctorate	5 (10.0%)	4 (8.0%)
Statistics self-rating*
mean (s.d.)	54.8 (19.2)	50.2 (16.3)
median [min, max]	57.5 [15.0, 99.0]	50.0 [12.0, 85.0]
Understand t-test**
mean (s.d.)	2.54 (0.885)	2.44 (0.705)
median [min, max]	2.00 [1.00, 4.00]	2.00 [1.00, 4.00]
Understand power***
mean (s.d.)	2.74 (0.876)	2.66 (0.895)
median [min, max]	3.00 [1.00, 4.00]	3.00 [1.00, 4.00]