Table 4.

Main results from study 3: Mean total performance scores

Reward
ConditionRole$0$0.5$10
Competition treatment conditionsNoncompetitor123.69 (90.54)**,a [110.87, 136.52] n = 88143.55 (47.94)a,b [133.09, 154.02] n = 83124.26 (59.39)**,b [111.75, 136.77] n = 89
Competitor158.08 (55.57)** [141.95, 174.22] n = 48136.60 (54.34) [119.88, 153.33] n = 43148.29 (48.38)** [138.99, 157.58] n = 98
Lottery control conditionsNon-lottery participantNA136.20 (53.59) [123.95, 148.44] n = 76136.03 (56.10) [122.65, 149.41] n = 70
Lottery participantNA139.68 (36.70) [126.22, 153.14] n = 31138.32 (44.18) [122.12, 154.53] n = 31
  • SDs in parentheses; 95% confidence intervals (CIs) in square brackets. Asterisks indicate significant differences between the means of competitors and noncompetitors in the same column according to t tests (both at P < 0.01). NA, not applicable.

  • a, bSignificant differences in means across different reward levels according to t tests (both at P < 0.05).