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Table 2 Between groups comparisons regarding social decision-making experiments

From: Cocaine use disorder in females is associated with altered social decision-making: a study with the prisoner’s dilemma and the ultimatum game

  Controls (n = 55) CUD (n = 129) Statistics p-value
Prisoner’s Dilemma χ2 = 17.05 0.001
 Remain silent % (n) [CI 95%] 33 (19) [21–46] 66 (86) [58–74]
Categories of motives (Remain silent)
 Lack of information % (n) [CI 95%] 26 (5) [4–48] 51 (44) [40–62] χ2 = 4.03 0.045
 Injustice/Internal values % (n) [CI 95%] 42 (8) [17–66] 36 (31) [26–46] χ2 = 0.21 0.646
 Strategy % (n) [CI 95%] 31 (6) [8–54] 8 (7) [2–14] χ2 = 7.73 0.005
 Religiosity % (n) [CI 95%] 0 (0) [0] 3 (3) [0–7] χ2 = 0.69 0.406
Ultimatum Game
 1° propose mean of offered chocolates (SD) [CI 95%] 4.26 (1.30) [3.91–4.61] 4.03 (1.31) [3.80–4.26] t = 1.12 0.261
 2° propose mean of offered chocolates (SD) [CI 95%] 5.16 (1.59) [4.73–5.58] 5.19 (2.06) [4.83–5.55] t = 0.10 0.915
 1° response (acceptance of 2 chocolates) % (n) [CI 95%] 39 (22) [26–52] 66 (86) [58–74] χ2 = 12.04 0.001
 2° response (acceptance of 4 chocolates) % (n) [CI 95%] 73 (25) [57–89] 74 (32) [60–88] χ2 = 0.10 0.930
  1. Legend: Control – Healthy control females without a history of substance abuse; CUD – Females diagnosed with Cocaine Use Disorder. Propose – Analysis when participants proposed the chocolate division. Response - Analysis when participants were responders of the offers. CI 95% - Confidence Intervals