Table 2.

Proportion of patients referred^a to the base hospital for examination by an ophthalmologist, overall and due to fundus photography findings or due to technician examination, stratified by vision center and step.

Time	Treatment	N	Nnonmissing	Referral Due to Fundus Photography		Referral Due to Regular Examination		All Referred
				Nreferred	Preferred	Nreferred	Preferred	Preferred	Preferred
Thirukanur (n=238)
Step 1	Control	47	43	2	0.05	15	0.35	17	0.40
Step 2	Intervention	41	41	0	0.00	16	0.39	16	0.39
Step 3	Intervention	43	43	5	0.12	11	0.26	16	0.37
Step 4	Intervention	65	65	4	0.06	18	0.28	22	0.34
Step 5	Intervention	42	42	6	0.14	11	0.26	17	0.40
Kurinjipadi (n=526)
Step 1	Control	121	118	5	0.04	26	0.22	31	0.26
Step 2	Control	119	119	0	0.00	22	0.18	22	0.18
Step 3	Intervention	110	109	9	0.08	23	0.21	32	0.29
Step 4	Intervention	119	119	9	0.08	31	0.26	40	0.34
Step 5	Intervention	57	57	4	0.07	23	0.40	27	0.47
Ulunthurpet (n=426)
Step 1	Control	71	69	3	0.04	18	0.26	21	0.30
Step 2	Control	98	98	5	0.05	28	0.29	33	0.34
Step 3	Control	77	77	1	0.01	28	0.36	29	0.38
Step 4	Intervention	97	96	11	0.11	24	0.25	35	0.36
Step 5	Intervention	83	83	20	0.24	20	0.24	40	0.48
Marakanam (n=257)
Step 1	Control	49	48	4	0.08	13	0.27	17	0.35
Step 2	Control	50	50	2	0.04	7	0.14	9	0.18
Step 3	Control	45	45	4	0.09	18	0.40	22	0.49
Step 4	Control	60	60	6	0.10	8	0.13	14	0.23
Step 5	Intervention	53	53	12	0.23	13	0.25	25	0.47

^aReferral data available for 727 of 737 control group participants (N_missing=10) and 708 of 710 intervention group participants (N_missing=2).