Variable Group Dose        
    placebo caffeine 150 caffeine 300 d-amph 20 effect size, η2ρ
systolic BP control 115.64 115.90 117.36 119.27  
    (3.41) (4.07) (4.20) (2.13)  
  cocaine 120.18 122.10 123.84 120.30  
    (1.40) (1.81) (2.18) (1.58)  
diastolic BP * control 74.82 75.33 77.94 77.83 0.49
    (2.78) (2.72) (1.42) (1.45)  
  cocaine 79.66 79.98 82.81 78.16  
    (3.01) (1.79) (1.74) (1.56)  
heart rate ** control 66.10 62.47 61.33 65.55 0.53
    (1.88) (2.09) (1.67) (1.23)  
  cocaine 63.08 62.60 61.57 63.51  
    (2.11) (3.00) (1.40) (2.99)  
Means (delta-method robust standard errors) for cardiovascular measures across placebo, 150 mg caffeine, 300 mg caffeine, and 20 mg d-amphetamine doses. Data are averaged across the seven time points on each dose day, and shown separately for control and cocaine-dependent groups
*= p < .05, main effect of dose, see text for details
**= p < .001, main effect of dose, see text for details
Table 1: Effects sizes are provided for statistically significant outcomes.