Table 3.

Distribution of IOP in the subjects not detected to have glaucoma and comparison of the same with those detected with POAG in each of the two divisions of the HRGS

	Rural			Urban
	IOP in “normal subjects”	IOP in POAG group	P (IOP normal POAG)	IOP in “normal subjects”	IOP in POAG group	P (IOP normal POAG)
Total	17.20	24.8	<0.001	17.40	23.8	<0.001*
40-49	16.20	23.9	<0.001	16.34	22.9	<0.001*
50-59	16.71	24.1	<0.001	16.75	23.2	<0.001*
60-69	17.10	24.9	<0.001	17.12	23.7	<0.001*
>=70	18.20	25.2	<0.001	18.24	24.2	<0.001*

*P<0.001: Statistically highly significant, POAG: Primary open-angle glaucoma, IOP: Intraocular pressure, HRGS: Hooghly river glaucoma study