Reliability of the PEDro scale: comparison between trials published in predatory and non-predatory journals

Table 2 Reliability of the PEDro scale estimated in trials published in non-Beall and in Beall journals

PEDro score	non-Beall journals						Beall journals
	ICC (95% C.I.)				SEM		ICC (95% C.I.)				SEM
	0.729 (0.632-0.803)				0.957		0.537 (0.425-0.634)				1.055
	% agreement	K	interpretation	P + +	Sa	Sd	% agreement	K	interpretation	P + +	Sa	Sd
PEDro scale item
2 Random allocation	95.8	N/a		95.8	1	0.04	94.4	.14	none to slight	93.8	0.99	0.02
3 Concealed allocation	89.1	.68	substantial	16.0	-0.64	0.05	93.3	.73	substantial	11.2	-0.76	-0.02
4 Groups similar at baseline	81.5	.62	substantial	48.7	0.20	-0.08	61.4	.19	none to slight	42.5	0.38	0.12
5 Subject blinding	90.8	.68	substantial	12.6	-0.72	0.05	94.4	.59	moderate	4.5	-0.90	0.02
6 Therapist blinding	95.8	.59	moderate	3.36	-0.93	-0.03	98.3	.56	moderate	1.1	-0.98	0.02
7 Assessor blinding	88.2	.70	substantial	21.0	-0.52	0.00	88.8	.60	moderate	11.2	-0.75	0.06
8 Less than 15% dropouts	71.4	.42	moderate	42.9	0.20	-0.02	60.3	.24	fair	32.4	0.07	-0.34
9 Intention-to-treat analysis	60.5	.21	fair	26.0	-0.14	0.18	59.2	.14	none to slight	11.2	-0.62	-0.49
10 Between-group statistical comparisons	89.1	.09	none to slight	88.2	0.98	0.04	87.1	.48	moderate	79.3	0.82	0.07
11 Point measures and variability data	89.9	.40	fair	85.7	0.91	0.03	94.4	.66	substantial	88.3	0.87	0.04
Quality discrimination^a	79.0	.57	moderate	31.9	-0.19	0.07	69.8	.28	fair	14.0	-0.60	-0.14

N/a Not available since no Table 2 × 2 created
^aBased on PEDro cut score = 6 (see main text for details)
ICC Intraclass Correlation Coefficient, CI confidence intervals, SEM Standard Error of the Measurement P + + agreement on the presence of the item, Sa symmetry expressions for agreement, Sd symmetry expressions for disagreement

ISSN: 2057-0082