Table 4.

Differences in Demographic, Anterior Segment Biometry, and Iris Characteristics Between Basal Insertion and Nonbasal Insertion Cohorts by Quadrant

	Basal Insertion Cohort	Nonbasal Insertion Cohort	P Value
Sex, M/F
S	90/107	86/75	0.15
N	64/68	112/114	0.84
I	68/77	108/105	0.48
T	52/55	124/127	0.89
ACD, mm
S	2.74 ± 0.42	2.69 ± 0.36	0.37
N	2.78 ± 0.37	2.69 ± 0.37	0.04
I	2.80 ± 0.39	2.67 ± 0.39	0.003
T	2.85 ± 0.38	2.67 ± 0.39	0.0001
ACW, mm
S	11.89 ± 0.51	11.86 ± 0.51	0.58
N	11.98 ± 0.52	11.81 ± 0.49	0.004
I	11.95 ± 0.51	11.82 ± 0.50	0.03
T	12.00 ± 0.49	11.82 ± 0.51	0.003
ACA, mm2
S	21.73 ± 4.76	21.06 ± 4.12	0.19
N	22.27 ± 4.79	20.96 ± 4.26	0.02
I	22.35 ± 4.54	20.82 ± 4.37	0.003
T	22.97 ± 4.39	20.78 ± 4.39	<0.0001
ACV, mm3
S	150.04 ± 43.17	145.0 ± 37.05	0.27
N	155.25 ± 43.52	143.56 ± 38.35	0.02
I	155.33 ± 41.55	142.75 ± 39.33	0.008
T	160.89 ± 40.59	142.28 ± 39.47	0.0003
IT750, mm
N	0.42 ± 0.07	0.44 ± 0.07	0.02
T	0.42 ± 0.07	0.44 ± 0.07	0.01
Iarea, mm2
N	1.48 ± 0.21	1.55 ± 0.24	0.009
T	1.46 ± 0.22	1.55 ± 0.23	0.004
Icurv, mm
N	0.21 ± 0.15	0.28 ± 0.13	0.0003
T	0.19 ± 0.14	0.28 ± 0.14	<0.0001

Data are presented as mean ± SD. P values are for Student's t-tests. P values in bold denote statistical significance (P < 0.05). Anterior segment and iris parameters were assessed by anterior segment optical coherence tomography. Data were obtained from a single image taken in the horizontal meridian. ASOCT measurements were compared based on subjects' iris insertion type in a particular quadrant (basal versus nonbasal). S, superior quadrant; N, nasal quadrant; I, inferior quadrant; T, temporal quadrant.