Duration of center of macula involvement when primary study outcome (DME involvement in center of macula determined by central grading of stereoscopic fundus photographs) was identified at a visit, participant was considered to have had definite center involvement for a specified length of time between the adjacent visits. Total duration of center involvement was calculated. Mean duration was total duration of center involvement divided by total number of participants. Participant durations were summarized, total number of months of center involvement in both treatment groups were displayed.

Intent-to-treat (ITT) population including all randomized participants analyzed according to the treatment group to which they were originally assigned by random allocation even if the participant does not take the assigned treatment, does not receive the correct treatment, or otherwise does not follow the protocol.

ETDRS VA: participant starts at the top of the chart containing 5 letters per row and reads down the chart until reaching a row where a minimum of 3 letters on a line cannot be read. Participant is scored by how many letters could be correctly identified. A higher number of letters correctly identified represents better visual acuity. Results are reported based on the number of diabetic retinopathy (DR) eyes.

Intent-to-treat (ITT) population including all randomized participants analyzed according to the treatment group to which they were originally assigned by random allocation even if the participant does not take the assigned treatment, does not receive the correct treatment, or otherwise does not follow the protocol.

The first occurrence of focal/grid photocoagulation regardless of diabetic macular edema (DME) distance from the center of the macula.

Intent-to-treat (ITT) population including all randomized participants analyzed according to the treatment group to which they were originally assigned by random allocation even if the participant does not take the assigned treatment, does not receive the correct treatment, or otherwise does not follow the protocol.

Pelli-Robson chart read from left to right + from top to bottom. Each line has 2 groups, each of 3 letters. Letters in each group have same contrast. Contrast in each successive group is less than the preceding group. Participant reads letters starting with highest contrast, continues until 2 or 3 letters in 1 group are incorrectly named. Scored on key showing all letters at full contrast, gives the log contrast sensitivity corresponding to each group. Score is determined by previous group (last group in which 2 or 3 letters were correctly named). Results reported based on number of DR eyes.

Intent-to-treat (ITT) population: all randomized participants analyzed according to treatment group to which they were originally assigned by random allocation even if they did not take the assigned treatment, did not receive the correct treatment, or otherwise did not follow the protocol.

Participants were classified as having experienced progression or no progression of DR by 36-month visit. Progression of DR=3 steps on ETDRS retinopathy severity person scale for participants with both eyes less than proliferative diabetic retinopathy (PDR) at baseline OR 2 steps on ETDRS retinopathy severity eye scale for participants with 1 eye less than PDR at baseline OR application of panretinal laser therapy. Participants were assigned at baseline to ETDRS retinopathy severity scale for persons or individual eyes; determination of no progression/progression was dependent on the scale.

Intent-to-treat (ITT) population including all randomized participants analyzed according to the treatment group to which they were originally assigned by random allocation even if the participant does not take the assigned treatment, does not receive the correct treatment, or otherwise does not follow the protocol.

The Modification of Diet in Renal Disease (MDRD) study formula used for the estimated glomerular filtration rate (eGFR) determination is: eGFR = 170 X (Serum creatinine concentration [mg/deciliter (dL)])-0.999 X (Age [years]) -0.176 X (0.762 if participant is female) X (1.180 if participant is black) X (Serum urea nitrogen concentration [mg/dL])-0.170 X (Serum albumin concentration [grams (g)/dL])+0.318.

Intent-to-treat (ITT) population including all randomized participants analyzed according to the treatment group to which they were originally assigned by random allocation even if the participant does not take the assigned treatment, does not receive the correct treatment, or otherwise does not follow the protocol.

The completer population includes participants who completed all 36 months of the treatment phase.

25 vision-targeted questions representing 11 vision-related constructs and a 1-item general health rating question. Measures the influence of visual disability and visual symptoms on generic health domains such as emotional well-being and social functioning and task-oriented domains related to daily visual functioning. Each item is converted to a 0 to 100 scale such that a higher score represents better functioning.

Intent-to-treat (ITT) population including all randomized participants analyzed according to the treatment group to which they were originally assigned by random allocation even if the participant does not take the assigned treatment, does not receive the correct treatment, or otherwise does not follow the protocol.

Summaries of serious adverse events (SAEs) and all other non-serious adverse events (AEs) are located in the Reported Adverse Event Module.

Safety population: all randomized participants who received at least one dose of study drug.

The occurrence of SMVL was defined as ≥15 letter decrease from baseline in best-corrected Early Treatment Diabetic Retinopathy Study (ETDRS) visual acuity (VA) in any DR study eye relative to baseline that is sustained for the last 6 months of participation. ETDRS VA: participant starts at the top of the chart containing 5 letters per row and reads down the chart until reaching a row where a minimum of 3 letters on a line cannot be read. Participant is scored by how many letters could be correctly identified. A higher number of letters correctly identified represents better visual acuity.

Intent-to-treat (ITT) population: all randomized participants with at least 1 eligible study eye analyzed according to the treatment group to which they were originally assigned by random allocation even if the participant does not take the assigned treatment, does not receive the correct treatment, or otherwise does not follow the protocol.