Table 2. The relationship between age and IOP in each age group.

Age group	Estimate	SE	DF	t-Value	Pr>|t|	Adjusted P-value
≤30s	−0.260	0.015	3616	−17.25	<0.0001	<0.0001
40s	−0.246	0.007	14 000	−34.26	<0.0001	<0.0001
50s	−0.243	0.008	11 000	−29.89	<0.0001	<0.0001
60s≥	−0.168	0.014	1698	−11.51	<0.0001	<0.0001

Abbreviation: DF, degree of freedom.

When analyzing the relationship between age and IOP in each age group, all age groups also showed negative estimate value. In addition, patients >60s had a less steep decreasing slope of IOP with age than patients under 30s (correlation coefficient −0.260 and −0.168, respectively).