Table 2.

Retinal oximetry and peripheral capillary non-perfusion results at baseline and 6 months follow-up.

	Baseline		6M follow-up	Baseline–6M difference	BL–6M paired
	n	Median±IQR	Median±IQR	Median±IQR	P values
Peripheral capillary non-perfusion
Global
Inactive PDR at 6M	23	26%–50% (2.0±2.3)	26%–50% (2.0±1.6)	0.3±0.9	0.38
Active PDR at 6M	10	51%–75% (3.3±1.3)	51%–75% (2.9±1.3)	−0.4±1.9	0.87
P values		0.03*	0.03*	0.79
Oximetry, %
Arteriolar
Inactive PDR at 6M	23	96.7±5.6	96.8±4.7	−0.1±5.1	0.92
Active PDR at 6M	10	93.4±6.4	93.3±7.2	−1.7±2.5	0.02*
P values		0.45	0.09	0.06
Venular
Inactive PDR at 6M	23	67.2±12.1	66.2±8.3	−1.1±15.8	0.69
Active PDR at 6M	10	63.6±14.8	68.7±14.7	1.2±5.9	0.16
P values		0.61	0.66	0.27

Retinal oxygen saturation and peripheral capillary non-perfusion (CNP) at baseline and follow-up month 6. Groups are compared as to inactive and active PDR at the specific time point. Peripheral CNP: 0–0.5 (close to no CNP), 1%–25% (>0.5–1.5), 26%–50% (>1.5–2.5), 51%–75% (>2.5–3.5), 76%–100% (>3.5–4.0). 6M data are corrected for rescue panretinal laser photocoagulation given to patients with active PDR at 3M (n=2).

*Statistically significant.

BL, baseline; CNP, capillary non-perfusion; PDR, proliferative diabetic retinopathy; 6M, 6 months’ follow-up.