Table 2 Mixed-effects linear regression analysis of the association between race and mean macular capillary parameters.

From: Evaluation of flow of chorioretinal capillaries in healthy black and white subjects using optical coherence tomography angiography

Macular capillary parameter

Regression coefficient

P value

Regression coefficient*

P* value

SCP VD (%)

Fovea

2.53 (0.37–5.04)

0.047

2.81 (0.084–5.54)

0.043

Parafovea

1.71 (0.45–2.97)

0.008

1.37 (0.27–2.47)

0.014

Total area of fovea and parafovea

0.98 (− 0.31–2.26)

0.136

0.66 (− 0.54–1.86)

0.284

ICP VD (%)

Fovea

4.21 (1.24–7.18)

0.005

3.96 (0.82–7.11)

0.014

Parafovea

2.24 (0.69–3.78)

0.005

2.64 (0.98–4.30)

0.002

Total area of fovea and parafovea

1.26 (− 0.23–2.76)

0.097

1.54 (0.01–3.06)

0.048

DCP VD (%)

Fovea

1.67 (− 0.91–4.26)

0.205

2.28 (− 0.41–4.96)

0.096

Parafovea

1.25 (− 1.28–3.78)

0.332

2.25 (− 0.42–4.92)

0.098

Total area of fovea and parafovea

0.86 (− 1.48–3.19)

0.473

1.54 (− 0.98–4.07)

0.23

FAZ Area (mm2)

 − 0.10 (− 0.16–(− 0.05))

 < 0.001

 − 0.07 (− 0.12–(− 0.02)

0.006

FAZ Perimeter (mm)

 − 0.29 (− 0.46–(− 0.12))

0.001

 − 0.23 (− 0.41–(− 0.47))

0.014

FAZ Acircularity Index

0.035 (0.008–0.061)

0.01

0.023 (− 0.002–0.49)

0.076

FD-300

 − 2.64 (− 4.02–(− 1.23))

 < 0.001

 − 2.34 (− 3.71–(− 0.97))

0.001

Choriocapillaris BFA (%)

Fovea

1.2 (0.06–2.3)

0.039

1.1 (− 0.10–2.3)

0.073

Parafovea

2.4 (0.46–4.4)

0.016

2.4 (0.19–4.6)

0.033

Total area of fovea and parafovea

1.5 (0.47–2.5)

0.004

1.5 (0.34–2.6)

0.011

  1. Regression Coefficient and P value accounting for 2 eyes of the same subject. Regression Coefficient* and P* value accounting for 2 eyes of the same subject and adjusting for axial length. VD = vessel density. SCP = superficial capillary plexus. ICP = intermediate capillary plexus. DCP = deep capillary plexus. FAZ = foveal avascular zone. FD-300 = capillary density in a 300 μm wide region around the FAZ. BFA = blood flow area.