Table 1 Study dataset patient demographics and characteristics.

Variable		N (%) or mean (SD)
Age	Years	56 (11)
Gender^a	Male	685 (48.0)
Gender^a	Female	743 (52.0)
Eye	Right	708 (49.5)
Eye	Left	723 (50.5)
Smoking status^b	Non-smoker	1,289 (90.1)
Smoking status^b	Current or former smoker	141 (9.9)
Diabetic status^b (Self-reported)	Unsure	363 (25.4)
	No	330 (23.1)
	Yes	737 (51.5)
HbA1C^c	%	7.8 (2.2)
Significant cataract in either eye	Yes	112 (7.8)
Cataract surgery in either eye	Yes	124 (8.7)
Right eye DR grade	No DR grade^d	24 (3.4)
	Non-referable DR^e	651 (91.9)
	Referable DR^f	33 (4.7)
Left eye DR Grade	No DR grade^d	93 (12.9)
	Non-referable DR^e	600 (83.0)
	Referable DR^f	30 (4.1)

SD Standard deviation, DR Diabetic retinopathy.
^a3 missing gender values.
^b1 missing value for smoking and diabetic status respectively.
^c23 missing HbA1C values.
^dPatient eyes with ungradable images only hence there is no DR grade.
^eIncludes no DR, mild DR and stable treated proliferative DR.
^fIncludes moderate non-proliferative DR, severe non-proliferative DR and proliferative DR.

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