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Table 1 Factors employed in analyses, the number of categories corresponding to each factor and the reference group used in regression analyses (if appropriate).

From: Defensible inferences from a nested sequence of logistic regressions: a guide for the perplexed

Factor name Number of categories Reference group
Age (set 1) 3 45–54
Gender (set 1) 2 Male
Parental education (set 1) 3 At least one parent with BA+
Books in the home (set 1) 3 100 books or more
Literacy & numeracy (set 2) Scale scores N/A
Educational attainment (set 2) 4 BA+