Table 3.

Diabetic Retinopathy in patients with DM in IMRD data on 1 January 2017

Diabetes (N)	DM		T1DM		T2DM
	180 824	%	12 434	%	168 390	%
No retinopathy coding available	82 119	45.41	3846	30.93	78 273	46.48
Retinopathy Coding available	98 705	54.59	8588	69.07	90 117	53.52
Pre-STR	67 750	37.47	3951	31.78	63 699	37.83
No DR (R0M0)	37 618	20.80	1472	11.84	36 146	21.47
R1	30 132	16.66	2479	19.94	27 553	16.36
STR	22 198	12.28	3693	29.70	18 505	10.99
STR without Rx or vision loss	13 165	7.28	2271	18.26	10 894	6.47
R2	2487	1.38	454	3.65	2033	1.21
R3	4729	2.62	1505	12.10	3224	1.91
M1	14 206	7.86	2440	19.62	11 766	6.99
STR with Rx and vision loss	9033	5.00	1422	11.44	7611	4.52
Laser	3092	1.71	885	7.12	2207	1.31
Vitreous injections/procedures	2536	1.40	637	5.12	1899	1.13
Vision loss/blindness	5050	2.79	384	3.09	4666	2.77
None specific for STR or Pre-STR	8757	4.84	844	6.79	7913	4.70
Any retinopathy	61 087	33.78	7016	56.43	53 971	32.05

Pre-STR is combination of no diabetic retinopathy and background retinopathy, R2 is preproliferative diabetic retinopathy, R3 is proliferative diabetic retinopathy, M1 is diabetic maculopathy, STR is a combination of R2, R3 and M1, non-specific retinopathy is where it cannot be categorised into R1 or STR. Where colour codes are assigned, the same colour indicates that they are mutually exclusive. Where colour codes are not assigned, they overlap within that category. For example, patients with M1 can have either R2 or R3, likewise patients who received laser treatment could have received vitreous injection. WHO standards⁵⁰ were used for vision loss. Here, all categories were combined into a single category.

DR, diabetic retinopathy; IMRD, IQVIA Medical Research Data; M0, no maculopathy; R0, no retinopathy; R1, background retinopathy; STR, sight-threatening retinopathy.