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Table 4 Mean risk perceptions of WLAN devices before and at the end of the experiment

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

  Risk perception WLAN T0 Risk perception WLAN T3 Test statistic for differences between T0 and T3
M (90% CI) M (90% CI)  
Whole sample
(N = 137)
2.58 (2.43–2.73) 2.42 (2.27–2.56) tdf = 136 = − 2.51 (p = .01)
Basic information
(N = 64)
2.56 (2.33–2.79) 2.33 (2.13–2.53) tdf = 63 = − 2.65 (p = .01)
Precautionary information (N = 73) 2.59 (2.38–2.79) 2.49 (2.28–2.70) tdf = 72 = − 1.04 (p = .30)