Table 5.

Wilcoxon Signed Rank Analysis.

	n	Mean rank	Sum of ranks	Z value	P value
Number of reports
Negative ranks	18a	14.58	262.50	−0.974b	.330
Positive ranks	11c	15.68	172.50
Ties	2d
Signal strength using ROR
Negative ranks	17a	14.76	251.00	−0.059b	.953
Positive ranks	14c	17.50	245.00
Ties	0d
Signal strength using PRR
Negative ranks	17a	14.91	253.50	−0.108b	.914
Positive ranks	14c	17.32	242.50
Ties	0d

Note. ROR = reporting odds ratio; PRR = proportional reporting ratio.

^aAfter < before.

^bBased on positive ranks.

^cAfter > before.

^dAfter = before.