Table 2.

Demographics of each tear dysfunction group and the control group.

Groups	N (eyes)	N (subjects)	Age-mean (years)	Age-range (years)	Male-to-female ratio
All subjects	128	64	56	19-87	0.37
All Tear Dysfunction	68	34	60	25-87	0.13
MGDa	23	13	57	25-85	0.18
ATDb	41	21	65	31-87	0.14
SSATDc	17	9	64	31-76	0.29
non-SSATDd	16	10	65	49-87	0.10
All controls	33	20	51	19-82	2.17
Controls ≥ 50 years	17	12	65	50-82	1.40
Controls < 50 years	16	8	22	19-27	3.00

^aMGD: meibomian gland disease

^bATD: aqueous tear deficiency

^cSSATD: Sjögren syndrome aqueous tear deficiency

^dnon-SSATD: non- Sjögren syndrome aqueous tear deficiency