Table 3. Association of smoking and SBP with OCT areas and volumes.

	Area CC	Area PR	Volume CC	Volume PR	RA
Smoking status, mean±SD
Nonsmokers (n=158)	0.2117±0.0517	0.1582±0.0397	0.0152±0.0056	0.0075±0.0025	0.5234±0.1301
Smokers (n=50)	0.1950±0.0862	0.1460±0.0614	0.0139±0.0094	0.0069±0.0035	0.3000±0.1372
P-valuea	0.87	0.87	0.91	0.89	0.24
Years smoked
≤5 (n=12)	0.0667±0.0596	0.0042±0.0040	0.0041±0.0038	0.0000±0.0000	0.0125±0.0120
6–19 (n=13)	0.4269±0.3052	0.1885±0.1488	0.0403±0.0347	0.0123±0.0110	0.1077±0.0995
≥20 (n=22)	0.1545±0.0515	0.2159±0.1041	0.0055±0.0019	0.0083±0.0042	0.4705±0.2699
P-valuea	0.32	0.06	0.59	0.08	0.15
SBP, mm Hg
<120 (n=68)	0.0772±0.0258	0.0985±0.0396	0.0029±0.0010	0.0040±0.0017	0.3059±0.1389
120–139 (n=66)	0.2250±0.0738	0.1568±0.0626	0.0136±0.0063	0.0082±0.0047	0.3614±0.1569
≥140 (n=31)	0.3968±0.1913	0.2839±0.1195	0.0370±0.0244	0.0128±0.0067	0.9565±0.3784
P-valuea	0.05	0.29	0.09	0.34	0.27
Spearman correlation with continuous years smoked, adjusted for age	0.23, P=0.12	0.29, P=0.05	0.20, P=0.17	0.40, P=0.005	0.24, P=0.10
Spearman correlation with continuous SBP	0.06, P=0.42	0.18, P=0.01	0.08, P=0.26	0.18, P=0.02	0.15, P=0.05

Abbreviations: CC, central circle; OCT, optical coherence tomography; PR, perifoveal ring; RA, retinal pigment epithelium atrophy; SBP, systolic blood pressure.

^aGeneralized estimating equations (GEE).