Table 3: Mean difference in clinical parameters in primary angle closure glaucoma (PACG) patients in association with the number of topical pressure-lowering agents and duration of treatment.

OSD parameter (mean, SD) Number of medication p value Duration of treatment p value
≤ 2 (N=22)
Mean (SD) 		≥ 2 (N=22)
Mean (SD) 		≤ 3 years (N=15)
Mean (SD) 		>3 years (N=29)
Mean (SD)
OSDI 20.5 (17.9) 18.6 (15.1) 0.972 17.3 (16.1) 20.2 (16.7) 0.413
Schirmers, mm 9.0 (8.0) 8.3 (8.0) 0.796 6.9 (7.1) 9.6 (8.3) 0.168
TBUT, seconds 7.5 (3.0) 6.5 (2.0) 0.311 7.1 (2.6) 7.0 (2.6) 0.940
Cornea staining 4.6 (3.1) 6.7 (2.7) 0.027 5.3 (2.8) 5.9 (3.2) 0.486

p<0.05 (Mann–Whitney test).
Abbreviation: OSD; ocular surface disease, OSDI; ocular surface disease index, TBUT; tear break-up time.