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Table 12 Background variables (regressors) used in logistic regression models

From: The professional development of VET teachers in Italy: participation, needs and barriers. Statistical quantifications and benchmarking in an international perspective

Regressors: variables, (number of categories) and (reference) categories
 R1: Teachers group (3 categories)
  Teachers of general subjects in schools with no VET programmes (Group A)
  Teachers of general subjects in schools with VET programmes (Group D)
  Teachers of vocational subjects in schools with VET programmes (Group C and reference category)
 R2: Gender (2 categories)
  Male
  Female (reference category)
 R3: Age (2 categories)
  < 50 years
  50+ years (reference category)
 R4: Education (2 categories)
  ISCED 5B and below
  ISCED 5A and above
 R5: Permanency of the job (2 categories)
  Fixed term contract
  Permanent contract; (reference category)
 R6: Intensity of work (2 categories)
  Part time
  Full time (reference category)
 R7: Prevalence of students with a first language different from that of instruction (2 categories)
  10% or less
  More than 10% (reference category)
 R8: Prevalence of students with special needs in the school (2 categories)
  10% or less
  More than 10% (reference category)
 R9: Prevalence of students from disadvantaged homes in the school (2 categories)
  30% or less
  More than 30% (reference category)
 R10: Extent to which the lack of resources for professional development of teachers (PD) in the school limits principal effectiveness (2 categories)
  Not at all/very little
  To some extent a lot (reference category)
  1. NB: Data refer to upper secondary teachers. Group C: teachers of vocational subjects in schools with VET programmes. Group A: teachers of general subjects in schools with no VET programme