Hybridisations with less bound material on the test channel than the determined cut-off are categorised as divergent or absent, those with higher signals are referred to as present.
Inactive lever presses can be categorised as inactive- CS) or inactive- CS orf) dependent on whether the presses were completed when the linactive- CShe actinactive- CSs illuminated offnot.
Active lever presses can be categorised as active- CS) or active- CS orf) dependent on whether the presses were completed when the light active- CSactive- CSer was illuminated offnot.
All these three determinants were initially explored as continuous variables and subsequently categorised as binary variables (using the median value as cut-off) for illustration of the results.
27 The continuous scores were categorised as limited, marginal or adequate, based on previously validated cut-offs.
The adolescent symptom load was categorised as high or low according to established and recommended cut-off values of the SCL-5 scores.
For example, a one-off acute episode of self-limiting illness would not be categorised as a health issue, whereas recurrent migraines leading to missed attendance would be.
Children were categorised as underweight, normal weight, overweight, or obese according to age and sex specific cut-offs for body mass index.
21 Children were categorised as underweight, healthy weight, overweight or obese using the 2nd, 85th and 95th centile cut-offs.
Respondents were categorised as non-cases (0 7), possible cases (8 11), and probable cases (12 21) for both anxiety and depression using established cut-offs.
