Table 5 Areas under the receiver operating characteristic curve (AUROCs) for discrimination of preperimetric glaucoma (PPG) from normal control.

	AUROC	95% CI		P-value
	AUROC	Lower bound	Upper bound	P-value
SD-OCT average RNFL thickness
Total	0.898	0.824	0.972	0.026^a
Superior	0.846	0.751	0.941	0.031^b
Inferior	0.910	0.841	0.979	0.019^c
SD-OCT thinner/thicker HF RNFL thickness ratio	0.687	0.552	0.821	0.822^d
SD-OCT average GCIPL thickness
Total	0.838	0.742	0.933	0.186^a
Superior	0.797	0.688	0.906	0.190^b
Inferior	0.806	0.704	0.909	0.396^c
SD-OCT thinner/thicker HF GCIPL thickness ratio	0.834	0.737	0.931	0.031^d
SAP MD	0.384	0.247	0.521	0.188^a
SAP PSD	0.589	0.448	0.729	0.104^a
PERG N95 Amplitude
Full field	0.738	0.615	0.861	N/A
Upper field	0.744	0.622	0.866	N/A
Lower field	0.689	0.560	0.819	N/A
PERG smaller/larger HF N95 amplitude ratio	0.663	0.530	0.796	N/A
PERG P50 Amplitude
Full field	0.680	0.546	0.814	0.103^a
Upper field	0.619	0.481	0.756	0.202^c
Lower field	0.582	0.439	0.726	0.033^b
PERG smaller/larger HF P50 amplitude ratio	0.534	0.391	0.677	0.175^d

Bold indicates that the P value reached statistical significance (< 0.05).
AUROC, Area Under the Receiver Operating Characteristic Curve; PPG, preperimetric glaucoma; CI, confidence interval; SD-OCT, spectral-domain optical coherence tomography; RNFL, retinal nerve fiber layer; HF, hemifield; GCIPL, ganglion cell–inner plexiform layer; SAP = standard automated perimetry; MD, mean deviation; PSD, pattern standard deviation; PERG, pattern electroretinogram.
^aP value: Comparison of each parameter with FF PERG N95 amplitude.
^bP value: Comparison of each parameter with LF PERG N95 amplitude.
^cP value: Comparison of each parameter with UF PERG N95 amplitude.
^dP value: Comparison of each parameter with smaller/larger HF PERG N95 amplitude ratio.

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