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Table 3 Example of categorisation from the survey (1).

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

Formaldehyde levels (ppb)

 

Adjusted

 

Prevalence (%)

Odds Ratio (95% CI)

Odds Ratio (95% CI)

< 18

15/298 (5.0)

1.00

 

18-27

15/299 (5.0)

1.03 (0.47-2.29)

1.00

28-46

17/301 (5.7)

1.11 (0.50-2.42)

 

≥47

10/100 (10.0)

2.36 (0.92-6.09)

2.25 (1.01-5.01)

  

P-value for trend = 0.08

 
  1. Prevalence of atopic eczema by formaldehyde levels [19].
  2. Reason for inclusion as an example. Two alternative groupings: 4 groups (split at 30th, 60th and 90th percentile) and top 10% versus the rest. Quantitative analysis also presented but not reported in abstract. P-value for trend calculated using category medians.
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Epidemiologic Perspectives & Innovations

ISSN: 1742-5573