Table 4. Scores on five personality factors for all placebo responders (n = 5) and placebo non-responders (n = 9), and differences for placebo responders (n = 5) from scores for placebo non-responders (n = 9).
International Personality Item Pool Factor |
Trait score Placebo responders |
Trait score Placebo non-responders |
Difference from placebo non-responders |
Chances effect is clinically positive (neutral/negative)+ |
|
Mean (SD) |
Mean (SD) |
Mean (SD) |
95%CI+ |
|
Extraversion |
89.4 (10.8) |
78.8 (8.7) |
10.6 (9.8) |
-.9 to 22.1 |
95 (3/2) |
Agreeableness |
95.4 (12.1) |
88.4 (9.8) |
7.0 (11.0) |
-6.0 to 19.9 |
80 (12/8) |
Conscientiousness |
98.0 (13.3) |
96.0 (12.3) |
2.0 (12.8) |
-13.3 to 17.3 |
48 (25/27) |
Neuroticism |
60.8 (11.1) |
59.7 (10.2) |
1.1 (10.7) |
-11.7 to 13.9 |
50 (15/35) |
Openness to experience |
78.6 (7.7) |
72.9 (7.0) |
5.7 (7.4) |
-3.1 to 14.5 |
86 (7/6) |
smallest worthwhile effect of 0.2 of standard deviation of placebo non-responders for each factor.* 95% CI = 95% confidence interval.