Table 4.

 Final screening outcomes at each grading level

Screening outcome	Level 1	Level 2	Level 3	Total No (%) (95% CI)
Re-screening in 12 months	3149 (56.5%)	1368 (24.5%)	79 (1.4%)	4596 (82.4) (81.5 to 83.4)
Re-screening in 6 months	NA	107 (1.9%)	21 (0.4%)	128 (2.3) (1.9 to 2.7)
Referral for slit lamp biomicroscopy	NA	649 (11.6%)	12 (0.2%)	661 (11.9) (11.0 to 12.7)
Referral to ophthalmology	NA	NA	190 (3.4%)	190 (3.4) (3.0 to 3.9)

NA, not applicable as these outcomes could not be assigned at this level.