Table 3.

Pearson’s linear correlation coefficient (R²) and paired t-test results comparing NA-AVR between left and right eyes for groups: all subjects (all), HT and NT

Measure	Group	Pearson’s linear correlation			Paired t-test			N
		R2	CI	P value	Difference	CI	P value
NA-AVR (unity)	All	0.34	0.26 to 0.42	<0.005	−0.03	−0.04 to −0.02	< 0.005	440
	HT	0.29	0.14 to 0.43	<0.005	−0.05	−0.07 to −0.03	< 0.005	151
	NT	0.30	0.19 to 0.40	<0.005	−0.02	−0.03 to −0.00	0.040	289
Arterioles (µm)	All	0.50	0.43 to 0.57	<0.005	−3.1	−4.1 to −2.0	< 0.005	440
	HT	0.50	0.38 to 0.62	<0.005	−4.6	−6.2 to −2.9	< 0.005	151
	NT	0.43	0.33 to 0.52	<0.005	−2.2	−3.5 to −0.9	< 0.005	289
Venules (µm)	All	0.31	0.22 to 0.39	<0.005	−0.6	−1.8 to 0.6	0.317	440
	HT	0.43	0.29 to 0.55	<0.005	−0.3	−2.3 to 1.7	0.776	151
	NT	0.24	0.13 to 0.35	<0.005	−0.75	−2.2 to 0.7	0.311	289

The mean diameters of arteriolar and venular components (µm) used to calculate NA-AVR are also shown. With 95% CI and 5% significance level (p). Significant p values are in bold.

HT, hypertension; NA-AVR, nasal–annular arteriole:venule ratio; NT, normotension.