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Table 1 Collection and uses of measures of socioeconomic status within intervention trials overall, and by year, region and behavioural outcome

From: Socioeconomic gradients in the effects of universal school-based health behaviour interventions: a systematic review of intervention studies

   All studies (n = 98) Study year (completed studies) Region Behavioural outcome
2008-2010 (N = 42) 2011-2014 (N = 56) Europe (N = 58) N America (N = 24) Australasia (N = 9) Asia (N = 3) S America (N = 4) Diet (N = 19) Physical activity (N = 20) Diet and PA (N = 21) Smoking (N = 15) Alcohol (N = 12) Smoking and alcohol (N = 11)
Measure collected Any measure of SES 71 26 45 46 15 7 1 2 14 14 16 13 8 6
School level (e.g. Free School Meals) 32 12 20 14 11 6 1 0 7 7 5 6 3 4
Family level (e.g. parental income) 48 18 30 37 7 3 0 2 8 10 11 9 6 5
Use of SES measures Sample descriptions 53 22 31 34 12 4 1 2 11 9 15 4 6 4
Control variables 24 8 16 16 3 4 0 1 6 4 6 5 2 1
Sampling procedures 19 9 10 9 5 4 1 0 4 4 3 3 3 2
Analysis of differential effect 21a 8 13 18a 1 1 1 0 4 1 8 4 2 2
  1. aincludes 2 protocols for which analysis not yet published – not included in synthesis