Objective The development of myopia is subject to individual genetic predisposition and environmental risk exposures. This ...

There is no established procedure for testing for trend with nominal outcomes that would provide both a global hypothesis test and outcome-specific inference. We derive a simple formula for such a ...

The proportional odds logistic regression model is widely used for relating an ordinal outcome to a set of covariates. When the number of outcome categories is relatively large, the sample size is ...

Low self-efficacy, poor sleep initiation, and high pain severity are independent, modifiable predictors of disability in older adults with chronic low back pain.