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Table 2 Mean scores (SD) of the log GHQ-12 Likert score, effort score, reward score and ERI ratio by the degree of NA influence across 10,000 simulated populations

From: Effort, reward and self-reported mental health: a simulation study on negative affectivity bias

   Percentage of items affected by NA
Mean scores (SD) across 10,000 simulated populations Percentage of subjects with NA 0% 10% 20% 30% 40%
Log GHQ12 Likert Score a 5 2.29(0.20) 2.29(0.21) 2.30(0.21) 2.30(0.21) 2.31(0.22)
  10 2.29(0.20) 2.30(0.21) 2.31(0.21) 2.32(0.22) 2.32(0.23)
  20 2.29(0.20) 2.31(0.21) 2.33(0.22) 2.35(0.24) 2.36(0.25)
Effort score (Siegrist) b 5 12.5(1.9) 12.5(1.9) 12.5(1.9) 12.6(2.0) 12.6(2.0)
  10 12.5(1.9) 12.5(1.9) 12.6(2.0) 12.6(2.0) 12.7(2.1)
  20 12.5(1.9) 12.6(1.9) 12.7(2.0) 12.8(2.1) 12.9(2.2)
Reward score (Siegrist) c 5 48.1(3.2) 48.0(3.3) 48.0(3.3) 47.9(3.3) 47.8(3.4)
  10 48.1(3.2) 48.0(3.3) 47.8(3.3) 47.7(3.4) 47.6(3.5)
  20 48.1(3.2) 47.8(3.3) 47.6(3.4) 47.4(3.5) 47.2(3.7)
Effort-reward Imbalance ratio (Siegrist) 5 0.478(0.081) 0.480(0.081) 0.481(0.083) 0.483(0.085) 0.485(0.088)
  10 0.478(0.081) 0.481(0.082) 0.485(0.085) 0.489(0.089) 0.493(0.095)
  20 0.478(0.081) 0.485(0.084) 0.492(0.089) 0.500(0.096) 0.508(0.105)
  1. a range possible values: 0 to 36
  2. b range possible values: 6 to 30
  3. c range possible values: 11 to 55
  4. Note: the unequal number of digits is due to the fact that variables considered have different scales.