Table 4: Correlations between score of dry eye with smoking parameters in dry eye group.

Dry eye score
𝑟 𝑃

Age−0.21 𝑃 = 0 . 1 6
Body mass index0.13 𝑃 = 0 . 3 9
Number of cigarettes per day0.74 𝑃 < 0 . 0 0 0 1
Duration of smoking exposure0.68 𝑃 < 0 . 0 0 0 1
Cotinine0.84 𝑃 < 0 . 0 0 0 1
Cotinine/creatinine ratio0.88 𝑃 < 0 . 0 0 0 1