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Table 3 Descriptive statistics of independent and dependent variables in the two experimental groups

From: Does precautionary information about electromagnetic fields trigger nocebo responses? An experimental risk communication study

 

Experimental condition

Test statistic for differences between groups

Basic information

(n = 62–64)

Basic + precautionary information (n = 71–73)

Independent variables

M (90% CI)

M (90% CI)

 

 Mean trait anxiety

2.22 (2.15–2.29)

2.23 (2.16–2.31)

tdf = 133 = −.22 (p = .82)

 Mean somatosensory amplification

2.71 (2.61–2.82)

2.83 (2.72–2.94)

tdf = 135 = −1.3 (p = .20)

 Sum social desirability

10.58 (10.05–11.10)

10.58 (10.02–11.13)

tdf = 135 = .01 (p = .99)

 T0 risk perception WLAN score

2.56 (2.33–2.79)

2.59 (2.38–2.79)

tdf = 135 = −.14 (p = .89)

 Mean T1 state anxiety

1.36 (1.29–1.42)

1.50 (1.41–1.59)

tdf = 134 = −2.18 (p = .03)

 Mean T2 state anxiety

1.29 (1.22–1.35)

1.42 (1.33–1.50)

tdf = 134 = − 1.96 (p = .05)

Dependent variables

 Mean symptom difference T3 – T2

.09 (.04–.14)

.12 (.07–.17)

tdf = 135 = −.65 (p = .52)

 Mean attributed symptoms

1.13 (1.09–1.16)

1.15 (1.11–1.19)

tdf = 135 = −.74 (p = .46)

 Sum of trials with belief to perceive sham EMF format

1.53 (1.17–1.90)

2.10 (1.70–2.49)

tdf = 135 = − 1.74 (p = .08)