Table 1.

Clinical parameters of the four study groups.

Parameter	Control	<5 years	5–10 years	>10 years
Age (yr)	64.88 ± 7.04	64.75 ± 8.20	65.03 ± 7.14	66.11 ± 7.44
Sex ratio (male/female)	18/22	20/24	17/23	16/20
TMH (mm)	0.23 ± 0.06	0.23 ± 0.05	0.21 ± 0.07	0.18 ± 0.06
NIKBUT-1st (s)	6.86 ± 2.20	6.76 ± 2.24	6.25 ± 2.53	5.13 ± 1.77
NIKBUT-avg (s)	9.33 ± 3.68	8.32 ± 2.63	8.21 ± 2.60	7.30 ± 1.63
Bulbar hyperemia	1.53 ± 0.69	1.57 ± 0.69	1.56 ± 0.57	1.92 ± 0.66
Limbal hyperemia	1.52 ± 0.67	1.57 ± 0.64	1.56 ± 0.55	1.93 ± 0.64
Meibography score	3.15 ± 1.09	3.13 ± 1.08	3.53 ± 1.05	4.25 ± 1.14