Parameter	Inclusion criteria	Exclusion criteria
Time frame	study published in or after 2000                                             	 study published before 2000                                              
Study type	primary research                                                             	 opinion piece, editorial, commentary, news article, literature review    
Study recency	most recent publication of study                                             	 gray literature superseded by white literature publication               
Study focus	inequality or labour market outcomes as primary outcome (dependent variable) 	 neither inequality nor labour market outcomes as dependent variable      
 	policy measure or strategy as primary intervention (independent variable)    	 no policy measure/strategy as intervention or relationship unclear       
 	specifically relates to some dimension of world of work                      	 exists outside world of work for both independent and dependent variables
 	focus on dimension of inequality in analysis                                 	 no focus on mention of inequality in analysis