Table 2—

Observed and expected numbers of nonprobands by severity of retinopathy in randomly assigned probands

Retinopathy in probandRetinopathy in nonproband
Four groups*PDRNPDR-SNPDR-ENone
    PDR
        Observed5161610
        Expected5111714
    NPDR-S
        Observed13182523
        Expected8183023
     NPDR-E
        Observed8214747
        Expected13284636
    None
        Observed13305230
        Expected
13
28

47
37
Three groupsSevereMildNone
    Severe
        Observed524133
        Expected424737
    Mild
        Observed294747
        Expected414636
    None
        Observed435230
        Expected

41
47
37


Two groupsSevereMild or none
    Severe
        Observed5274
        Expected4284
    Mild or none
        Observed72176
        Expected82166
  • *

    * 0.05 < P < 0.10;

  • P < 0.10.