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Table 3 Descriptive and statistical tests for heart rate, respiration rate, and LFP/HFP ratio among stage, exposure, and interaction

From: Effects of short-term radiation emitted by WCDMA mobile phones on teenagers and adults

  Heart rate (bpm) Respiration rate (bpm) LFP/HFP ratio
  Adult Teenager Adult Teenager Adult Teenager
  Sham Real Sham Real Sham Real Sham Real Sham Real Sham Real
Stage Mean (standard error)
 I 76.6 (2.1) 79.1 (1.9) 79.3 (2.1) 80.9 (1.7) 18.0 (0.5) 18.3 (0.5) 19.3 (0.5) 19.2 (0.4) 1.9 (0.3) 2.3 (0.4) 1.6 (0.3) 1.5 (0.3)
 II 76.6 (2.1) 77.9 (1.7) 79.8 (1.8) 80.4 (1.6) 18.2 (0.4) 18.1 (0.6) 19.3 (0.5) 19.3 (0.6) 2.6 (0.4) 3.1 (0.7) 1.7 (0.3) 2.0 (0.4)
 III 75.4 (2.0) 77.5 (1.7) 80.7 (1.8) 80.7 (1.7) 18.4 (0.5) 18.2 (0.5) 19.2 (0.5) 19.8 (0.5) 2.3 (0.3) 3.6 (1.0) 2.6 (0.5) 1.9 (0.3)
 IV 76.5 (2.1) 77.1 (1.7) 81.2 (1.6) 81.0 (1.7) 18.2 (0.5) 17.9 (0.6) 19.7 (0.5) 20.3 (0.5) 3.2 (0.7) 2.9 (0.6) 2.3 (0.5) 2.3 (0.4)
Factor P-value (F - statistic)
Exposure 0.328 (0.997) 0.671 (0.184) 0.843 (0.040) 0.433 (0.635) 0.307 (1.088) 0.661 (0.197)
Stage 0.211 (1.644) 0.323 (1.180) 0.677 (0.510) 0.067 (2.481) 0.033* (3.723) 0.002* (5.492)
Interaction (exposure and stage) 0.324 (1.168) 0.209 (1.600) 0.633 (0.575) 0.444 (0.903) 0.267 (1.350) 0.222 (1.562)
  1. *P < 0.05, bpm; beats per min.
  2. LFP/HFP ratio; low-frequency power/high-frequency power (power spectrum of heart rate variability).
  3. Stage I; pre-exposure, Stage II; after 11 min of exposure, Stage III; after 27 min of exposure, Stage IV; post-exposure.