In addition to common fibromyalgia symptoms, clinical characteristics (for example, body mass index), health behaviors (for example, physical activity levels), and psychological variables (for example, negative affect, catastrophizing, affect regulation), also demonstrate strong associations with fatigue [ 22- 27] (Table 1).
4 5 Concerns about childhood obesity have resulted in national or regional surveillance programmes that record weight and height in order to monitor trends in overweight and obesity based on body mass index (BMI), for example, the National Health and Nutrition Examination Survey (NHANES) in the USA and the National Child Measurement Programme (NCMP) in England.
Non participation or loss to follow up was associated with lower educational levels, higher levels of impairment, age, smoking, body mass index, cardiovascular risk (for example diabetes and hypertension) and membership of an ethic minority group [ 36, 38, 39, 44, 46].
For example, body mass index was missing for 7% of case patients, but 15% of control patients.
Some of the factors are either unavailable (for example, parity, body mass index, or smoking) or are poorly recorded (for example, a substantial proportion of births are missing data on race/ethnicity) in the survey.
When considering the whole cohort of patients with a normal first postdischarge oral glucose tolerance test (the eligible cohort), what was the predictive role for traditional predictors of diabetes mellitus and prediabetes mellitus (DM/pre-DM) (for example, age, family history, body mass index) and for inhospital variables (for example, severity of illness)?
For example body mass index, height, presence and family history of hypertension were considered for neural network and not for multiple logistic function model.
For example, body mass index seems to be a risk factor for colorectal cancer but not endometrial cancer in Lynch syndrome.
For example, body mass index or BMI (also known as the Quetelet Index for its creator, Belgium statistician Adolphe Quetelet, 1796 1874), is the most commonly used measure of obesity internationally [ 54].
Finally, the potential for residual confounding by factors unknown exists; a substantial amount of data on the women's smoking status was missing and other potentially important confounding factors (for example, body mass index) were not measured.
