Table 3.
Factors associated with placebo response (PR) in the teachers' Conners' Global Index (CGI‐T) ratings
| CGI‐T during baseline week, mean (SD) | CGI‐T during placebo week, mean (SD) | Interaction statistic and p‐value, partial eta squared | |
|---|---|---|---|
| Income a | F 1,494 = 0.059, p = 0.808; 0.00 | ||
| Low (N = 197) | 71.91 (11.90) | 67.80 (13.26) | |
| High (N = 299) | 67.57 (12.17) | 63.68 (13.44) | |
| Marital status b | F 1,471 = 0.36, p = 0.55; 0.001 | ||
| Single (N = 208) | 71.39 (12.01) | 66.85 (13.93) | |
| Couples (N = 265) | 68.02 (12.30) | 64.06 (13.25) | |
| Gender | F 1,526 = 1.52, p = 0.217; 0.003 | ||
| Boys (N = 420) | 68.72 (11.40) | 65.08 (12.88) | |
| Girls (N = 108) | 71.56 (15.52) | 66.53 (15.85) | |
| Ethnicity | F 1,525 = 5.397, p = 0.021; 0.010 | ||
| Caucasian (N = 459) | 69.48 (12.27) | 65.14 (13.40) | |
| Others (N = 68) | 68.41 (13.07) | 67.19 (14.33) | |
| Stress disorders | F 1,491 = 0.010, p = 0.920; 0.000 | ||
| No (N = 456) | 69.11 (12.31) | 65.07 (13.43) | |
| Yes (N = 37) | 70.05 (13.19) | 65.84 (14.36) | |
| Conduct disorder (CD) | F 1,519 = 0.41, p = 0.523; 0.001 | ||
| No (N = 425) | 69.34 (12.56) | 65.18 (13.53) | |
| Yes (N = 96) | 69.20 (11.43) | 65.78 (13.38) | |
| Oppositional defiant disorder (ODD) | F 1,520 = 0.298, p = 0.586; 0.001 | ||
| No (N = 318) | 68.08 (12.11) | 63.86 (12.93) | |
| Yes (N = 204) | 71.31 (12.49) | 67.60 (14.07) | |
| Anxiety disorders | F 1,492 = 0.306, p = 0.580; 0.001 | ||
| No (N = 283) | 69.37 (12.24) | 65.6 (13.43) | |
| Yes (N = 211) | 68.91 (12.48) | 64.62 (13.62) | |
| Time of giving placebo | F 1,524 = 0.170, p = 0.680; 0.000 | ||
| First week (N = 279) | 68.94 (12.27) | 64.86 (13.43) | |
| Second week (N = 247) | 69.64 (12.57) | 65.93 (13.72) | |
| Mothers' level of education c | F 1,470 = 2.04, p = 0.154; 0.004 | ||
| Low (N = 170) | 72.06 (11.64) | 68.59 (13.15) | |
| High (N = 302) | 68.03 (12.24) | 63.14 (13.23) | |
| ADHD subtype | F 2,525 = 1.95, p = 0.143; 0.007 | ||
| Inattentive (N = 196) | 65.68 (13.11) | 61.55 (12.87) | |
| Hyperactive (N = 48) | 73.13 (10.69) | 66.63 (13.77) | |
| Combined (N = 284) | 71.15 (11. 56) | 67.80 (12.69) | |
| Previous medications | F 1,506 = 15.50, p = 0.000; 0.030 | ||
| No (N = 324) | 69.05 (12.23) | 63.78 (13.69) | |
| Yes (N = 184) | 70.05 (12.42) | 68.49 (12.81) | |
a
Income was grouped into two categories: (a) low ≤ $30,000 and (b) high > $30,000 (Canadian dollars).
b
Marital status was grouped into two categories: (a) single, includes: separated/divorced, single or widow/windower and (b) couples, includes: married or living together
c
Mother's education level was divided in: (a) lower education ≤11 years (i.e. high school education or less in Quebec) and (b) high education >11 years