Regression analyses
Table 2 displays the results of the univariate logistic regression
analyses. Current smoking was found to significantly increase the risk
of NFL (odds ratio (OR) 4.7, Confidence Interval (CI) 1.7-13, p=0.003).
A multivariate binary logistic regression using backward elimination
method did not identify any other significant variables while current
smoking was confirmed to be a strong predictor of NFL (OR 6.8, CI
2.1-22.3, p<0.001).