Table 3. Logistic regression analysis of the relationship between tear lipid layer status in VDT users and working duration.
Category | Sub category | Tear lipid layer status (DR-1 grade >3) | OR† * | 95% C I§ | |
Cases | Controls | ||||
(n = 109) | (n = 492) | ||||
VDT working year | <4 | 36 | 142 | reference | |
4–8 | 22 | 108 | 0.90 | 0.49, 1.64 | |
8–12 | 29 | 137 | 0.99 | 0.55, 1.76 | |
≥12 | 22 | 105 | 1.05 | 0.53, 2.09 | |
P trend = 0.896 | |||||
Daily VDT hour | ≤2 | 20 | 82 | reference | |
2–4 | 25 | 133 | 0.75 | 0.39, 1.45 | |
4–6 | 20 | 119 | 0.66 | 0.33, 1.32 | |
6–8 | 24 | 117 | 0.80 | 0.41, 1.59 | |
>8 | 20 | 41 | 2.03 | 0.96, 4.34 | |
P trend = 0.190 |
†OR: odds ratio;
*Adjusted for gender and age;
§Confidence interval.