Table 3 The means, standard deviations, (in parentheses) and F-statistics of pain outcomes 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

 

Scales

Physical-possession (n = 30)

Psychological-possession (n = 29)

No-possession (n = 29)

F-statisticsa

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

Post-Hocb

Baseline measures

Verbal and written pain intensity NRS

0–10

0.00 (0.00)

0.00 (0.00)

0.00 (0.00)

   

MPQ pain intensity

0–5

0.00 (0.00)

0.00 (0.00)

0.00 (0.00)

   

MPQ pain severity

cm

0.00 (0.00)

0.00 (0.00)

0.00 (0.00)

   

Face pain intensity

1–6

0.00 (0.00)

0.00 (0.00)

0.00 (0.00)

   

Pain unpleasantness VAS

cm

0.16 (0.86)

0.00 (0.00)

0.01 (0.04)

0.90

0.02

 

Reference pain

0–5

3.31 (0.91)

3.10 (0.86)

2.94 (0.72)

1.43

0.03

 

Objective physical measures

Pain threshold

s

14.77 (14.23)

7.62 (4.62)

7.20 (3.73)

6.65**

0.14

Phy < Psy

Phy < No

Psy = No

Pain tolerance

s

130.37 (66.88)

69.51 (54.19)

88.89 (67.11)

7.19**

0.15

Phy < Psy

Phy < No

Psy = No

Subjective self-reported measures

Verbal pain intensity NRS

0–10

7.08 (1.37)

6.58 (1.41)c

6.74 (1.13)d

1.07e

0.03

 

Written pain intensity NRS

0–10

8.10 (1.71)

8.38 (1.76)

7.90 (2.02)

0.51

0.01

 

MPQ pain intensity

0–5

2.98 (0.87)

3.02 (0.84)

3.01 (0.96)

0.02

0.000

 

MPQ pain severity

cm

7.46 (1.79)

7.73 (1.94)

7.30 (2.11)

0.36

0.009

 

MPQ pain quality

0–3

1.29 (0.53)

1.40 (0.61)

1.37 (0.54)

0.34

0.008

 

Face pain intensity

1–6

3.37 (1.10)

3.41 (1.21)

3.41 (1.05)

0.02

0.00

 

Pain unpleasantness VAS

cm

5.75 (2.72)

6.11 (2.55)

6.05 (2.98)

0.15

0.003

 
  1. Values outside parentheses are means, inside are standard deviations.
  2. Phy physical possession, Psy psychological possession, No no possession.
  3. **p < 0.005.
  4. aFor univariate F-tests, degrees of freedom are (2, 85).
  5. bGames–Howell post-hoc comparisons were utilized.
  6. cn = 27.
  7. dn = 26.
  8. eFor univariate F-tests, degrees of freedom are (2, 80).