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Table 1 Demographic characteristics of the psychometric validation study population (n = 210)

From: Development and validation of the impact of dry eye on everyday life (IDEEL) questionnaire, a patient-reported outcomes (PRO) measure for the assessment of the burden of dry eye on patients

Characteristics Control
(n = 48)
Non-SS KCS*
(n = 130)
SS*
(n = 32)
Sex (n (%))
Male 13 (27) 27 (21) 3 (9)
Female 35 (73) 103 (79) 29 (91)
Age (Year)
Mean 39.2 55.2 58.3
Standard deviation 11.8 15.3 11.8
Range 20.0-66.0 22.0-89.0 34.0-80.0
Ethnicity (n (%))
Caucasian 34 (71) 106 (82) 31 (97)
African-American 6 (13) 12 (9) 1 (3)
Hispanic/Spanish-American 5 (10) 5 (4) 0 (0)
Asian/Oriental/Pacific Islands 1 (2) 6 (5) 0 (0)
Other 2 (4) 1 (1) 0 (0)
Highest level of education (n (%))
High school diploma or less 9 (19) 23 (18) 6 (19)
Some college 13 (27) 47 (36) 8 (25)
College degree 15 (31) 29 (22) 11 (34)
Graduate/postgraduate 8 (17) 31 (24) 5 (16)
Other 3 (6) 0 (0) 2 (6)
  1. * Non-SS KCS, Non Sjögren keratoconjunctivitis sicca; SS, Sjögren Syndrome [13]