Table 2.

Statistical Comparisons Among the Seven Tests

Test	IOP	HRT	FDT	mfVEP	ONP	SAP	SWAP
IOP	—	0.011	0.007	0.001	<0.001	<0.001	<0.001
HRT		—	0.856	0.214	<0.001	<0.001	<0.001
FDT			—	0.400	0.003	<0.001	<0.001
mfVEP				—	0.027	0.027	<0.001
ONP					—	0.635	0.042
SAP						—	0.016
SWAP							—

IOP = intraocular pressure; HRT = Heidelberg retina tomograph; FDT = frequency doubling perimetry; mfVEP = multifocal visual evoked potential; ONP = optic nerve photography; SAP = standard automated perimetry; SWAP = short wavelength automated perimetry.

Comparison among the 7 tests. The tests are ordered according to mean per-subject rank as shown in Table 1. The P values represent the results of Wilcoxon rank-sum tests to determine whether the scores were significantly different between the 2 tests.