Table 2 The means, standard deviations (in parentheses), and F-statistics of psychological-state variables as a function of possession condition.

From: Temporal expectancy induced by the mere possession of a placebo analgesic affects placebo analgesia: preliminary findings from a randomized controlled trial

 

Scale

Physical-possession (n = 30)

Psychological-possession (n = 29)

No possession (n = 29)

F-statisticsa

Effect size (\({\eta }_{p}^{2})\)

Post-Hoc

Pain reduction motive

1–7

5.73 (0.94)

5.75 (0.88)

5.66 (1.05)

0.08

0.002

 

Perceived effectiveness

1–7

4.90 (0.86)

5.03 (0.880)

5.03 (0.83)

0.22

0.005

 

Guess temperature

°C

− 2.13 (9.00)

− 3.59 (8.95)

− 2.03 (14.71)

0.17

0.004

 

Positive affect

1–5

2.27 (0.67)

2.1 (0.67)

2.34 (0.82)

0.66

0.02

 

Negative affect

1–5

1.40 (0.47)

1.39 (0.40)

1.40 (0.48)

0.004

0.00

 

Perceived efficacy

1–7

4.98 (0.82)

4.72(0.87)

4.80 (0.85)

0.74

0.02

 

Expected pain intensity

0–10

6.73 (1.05)

6.00 (1.79)

6.52 (1.50)

1.91

0.04

 

Expected pain severity

1–5

2.73 (0.785)

2.48 (0.738)

2.93 (0.753)

2.54

0.06

 

State anxiety

1–4

2.14 (0.482)

2.28 (0.457)

2.19 (0.38)

0.79

0.02

 

Social desirability

0–13 (yes/no)

5.60 (3.07)

7.34 (2.42)

7.38 (2.87)

3.90*

0.08

Phy < Psy

Phy < No

Psy = No

  1. Values outside parentheses are means, inside are standard deviations.
  2. Phy physical possession, Psy psychological possession, No no possession.
  3. *p < 0.05.
  4. aFor univariate F-tests, degrees of freedom are (2, 85).
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