Categorisation of continuous risk factors in epidemiological publications: a survey of current practice

Table 4 Example of categorisation from the survey (2).

Inflammation (C-reactive protein≥8 μg/ml) before 21 weeks' gestation and risk of spontaneous pre-term birth by preterm birth status [20].
Reason for inclusion as an example. Dichotomisation of inflammation with no alternative grouping presented. Quantitative analysis also presented but not reported in abstract.