Passive Smoking as a Risk Factor of Dry Eye in Children

Table 5

Multiple regression analysis of different factors.

	BETA	𝑡	𝑃-level
Age	−0.020	−0.285	0.777
BMI	0.059	0.811	0.422
Vitamine deficiency	−0.022	−0.314	0.755
Duration of smoking	−0.025	−0.219	0.827
Number of cigarettes per day	0.337	3.251	0.002
Cotinine	−0.119	−0.417	0.679
Cotinine/creatinine ratio	0.786	2.916	0.005

𝑅=0.909, 𝑅²=0.827, Adjusted 𝑅²=0.796, 𝐹=26.638, 𝑃<0.00000, sd. error of estimate: 0.469.
BMI: body mass index.