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Table 3 Descriptive statistics of studies reviewed

From: Effects of organisational-level interventions at work on employees’ health: a systematic review

Variable Number of studies/median and range
EGP occupational class  
  I-III 18
  I-III, VI-VII 6
  VI-VII 15
Study design  
  Quasi-experimental, cross-sectional 1
  Quasi-experimental one-group prospective 9
  Quasi-experimental prospective with control group 21
  Quasi-experimental prospective and retrospective 2
  Randomized controlled 6
Evidence grade  
  High 4
  Medium 25
  Low 10
Significant intervention effects  
  No 21
  Yes 18
Intervention type  
  Organisational intervention (OI) 9
  Participatory (including Participatory Ergonomics PE and Participatory Research Action PAR) 7
  Shift schedules 18
  Other 5
  Year of publication 2005 [1993, 2012]
  Sample size at baseline 300 [41, 3506]
  Sample size at follow-up 187 [36, 2617]
  Sample size of control group 122 [31, 347]
  Follow-up time (years) 1 [0.25, 13]
  Study quality 7 [1,11]
  Number of working conditions changed 2 [1,4]