Table 5.

Mean IOP across different age groups for Tono-Pen and corrected GAT

	Mean IOP ± SD, mm Hg	p value
30–39 years
Tono-Pen	18.8 ± 3.2	0.24
GAT	16.1 ± 3.9
Mean difference	2.0 ± 3.6
40–49 years
Tono-Pen	20.3 ± 6.6	0.26
GAT	16.0 ± 4.6
Mean difference	4.3 ± 1.8
50–59 years
Tono-Pen	20.0 ± 4.6	0.004
GAT	18.9 ± 6.4
Mean difference	1.1 ± 3.6
60–69 years
Tono-Pen	22.7 ± 9.9	<0.001
GAT	20.5 ± 11.1
Mean difference	2.2 ± 4.0
>70 years
Tono-Pen	20.2 ± 4.8	<0.001
GAT	19.3 ± 5.2
Mean difference	3.2 ± 0.7