Table 2. Intraocular pressure in the non-glaucomatous participants of the Beijing Eye Study 2011, stratified by age.

		Intraocular pressure (mmHg)
Age group (year)	n.	Mean	Standard deviation	95% Confidence interval	95% Percentile	97.5% Percentile
50 to <55	631	15.1	2.7	9.9–20.3	20	21
55 to <60	606	14.7	2.6	9.7–19.7	19	20
60 to <65	476	14.4	2.6	9.2–19.5	19	20
65 to <70	444	14.7	2.8	9.3–20.1	20	20
70 to <75	460	14.2	2.5	9.2–19.2	19	20
75 to <80	323	13.9	2.8	8.4–19.3	19	20
80+	195	13.0	2.6	7.8–18.2	18	19