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Table 1 Tear breakup time and Oxford Schema in relation to risk factors

From: Prevalence of dry eye syndrome in residents of surgical specialties

Variable Tear breakup time <10 s Tear breakup time >10 s P value Oxford Schema 0 Oxford Schema 1 P value
1st year of residency 33 (79 %) 9 (21 %) 0.008 28 (67 %) 14 (33 %) 0.06
2nd year of residency 34 (63 %) 20 (37 %) 0.88 45 (83 %) 9 (17 %) 0.54
3rd year of residency 32 (47 %) 36 (53 %) 0.14 58 (85 %) 10 (15 %) 0.29
4th year of residency 23 (68 %) 11 (32 %) 0.23 22 (65 %) 12 (35 %) <0.001
5th year of residency 7 (32 %) 15 (68 %) 0.02 19 (86 %) 3 (14 %) 0.33
6th year of residency 10 (56 %) 8 (44 %) 0.91 16 (89 %) 2 (11 %) 0.27
7th year of residency 1 (12 %) 7 (88 %) 0.01 8 (100 %) 0 (0 %) 0.16
Chronic eye disease 43 (58 %) 31 (42 %) 0.80 62 (84 %) 12 (16 %) 0.29
Contact lenses 13 (81 %) 3 (19 %) 0.04 9 (56 %) 7 (44 %) 0.02
Refractive surgery 19 (68 %) 9 (32 %) 0.21 24 (86 %) 4 (14 %) 0.39
Allergies 41 (66 %) 21 (34 %) 0.09 52 (84 %) 10 (16 %) 0.34
Smoking 21 (50 %) 21 (50 %) 0.32 32 (76 %) 10 (24 %) 0.53
Hormonal contraceptives 9 (56 %) 7 (44 %) 0.10 14 (87 %) 2 (13 %) 0.51
Makeup use 41 (71 %) 17 (29 %) 0.66 51 (88 %) 7 (12 %) 0.04
Makeup use, 0–12 h 23 (68 %) 11 (32 %) 0.54 34 (100 %) 0 (0 %) 0.001
Makeup use, 12–24 h 18 (75 %) 6 (25 %) 0.54 17 (71 %) 7 (29 %) 0.001
Microscope use 73 (68 %) 35 (32 %) 0.10 84 (78 %) 24 (22 %) 0.003