Table 2. Mean numbers of immunoreactive blood vessels and stromal cells in epiretinal membranes in relation to type of proliferative diabetic retinopathy (PDR).

Variable	Active PDR(n = 8)Mean ± SD	Inactive PDR(n = 10)Mean ± SD	p-value(Mann-Whitney test)
• Blood vessels expressing CD34	110.3±83.5	32.9±14.0	0.001*
• Blood vessels expressing neurotrophin-3	13.5±9.6	11.7±13.5	0.529
• Cells expressing neurotrophin-3	111.9±48.6	48.3±29.0	0.003*
• Blood vessels expressing TrkA	19.8±10.0	13.4±5.8	0.092
• Cells expressing TrkA	96.9±44.6	46.9±23.8	0.015*
• Blood vessels expressing TrkB	13.9±8.3	11.6±6.8	0.469
• Cells expressing TrkB	126.9±52.0	61.7±38.1	0.014*
• Blood vessels expressing TrkC	16.9±8.1	8.5±8.6	0.073
• Cells expressing TrkC	85.8±50.9	38.6±22.6	0.011*

^*Statistically significant at 5% level of significance.