Table 1.

Comparison of Demographics and Ocular Biometric Factors Between Clusters 1 and 2 From the 2-Cluster Analysis

Lighting	Mean Parameters (Mean ± SD)	Cluster 1	Cluster 2	P Valuea
Dark		N = 132	N = 27
	Sex (F:M)b	100:32	22:5	0.52
	Age, yb	62.3 ± 7.87	58.8 ± 6.78	0.03
	IOPb (mm Hg)	16.368 ± 3.616	15.321 ± 2.688	0.14
	PAC/G:PACSc	36:96	3:24	0.08
	AOD750 (mm)	0.157 ± 0.051	0.225 ± 0.055	<0.001
	TISA750 (mm2)	0.088 ± 0.034	0.114 ± 0.024	<0.001
	IA (mm2)	1.611 ± 0.213	1.554 ± 0.213	0.24
	IT750 (mm)	0.398 ± 0.080	0.425 ± 0.052	0.02
	IC (mm)	0.297 ± 0.060	0.206 ± 0.060	<0.001
	ACD (mm)	2.137 ± 0.195	2.420 ± 0.184	<0.001
	LV (mm)	0.838 ± 0.157	0.573 ± 0.136	<0.001
	ACW (mm)	11.509 ± 0.195	11.454 ± 0.281	0.49
	PD (mm)	3.670 ± 0.657	4.259 ± 0.880	<0.001
Light		N = 126	N = 33
	Sexb (F:M)	98:28	24:9	0.54
	Age,b y	62.1 ± 8.26	60.5 ± 5.61	0.66
	IOPb (mm Hg)	16.306 ± 3.557	15.747 ± 3.236	0.36
	PAC/G:PACSc	36:90	3:30	0.02
	AOD750 (mm)	0.218 ± 0.054	0.311 ± 0.047	<0.001
	TISA750 (mm2)	0.126 ± 0.034	0.164 ± 0.026	<0.001
	IA (mm2)	1.811 ± 0.221	1.888 ± 0.218	0.08
	IT750 (mm)	0.339 ± 0.065	0.332 ± 0.046	0.58
	IC (mm)	0.301 ± 0.072	0.256 ± 0.056	<0.001
	ACD (mm)	2.101 ± 0.168	2.464 ± 0.142	<0.001
	LV (mm)	0.867 ± 0.158	0.656 ± 0.124	<0.001
	ACW (mm)	11.483 ± 0.375	11.685 ± 0.362	0.006
	PD (mm)	2.553 ± 0.592	2.567 ± 0.351	0.32

ACD, anterior chamber depth; ACW, anterior chamber width; AOD, angle opening distance; IA, iris area; IC, iris curvature; IOP, intraocular pressure; IT, iris thickness; LV, lens vault; PAC, primary angle closure; PACS, primary angle closure suspect; PACG, primary angle closure glaucoma; PD, pupillary diameter; TISA, trabecular iris surface area.

^aStatistical significance tested by Wilcoxon t-test or two-sample t-test.

^bPost hoc; not included in cluster analysis.

^cStatistical significance tested by Chi-squared test.