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

From: Effects of 60 Hz magnetic fields on teenagers and adults

  Heart rate (bpm) Respiration rate (bpm) LFP/HFP (%)
  Adult Teenager Adult Teenager Adult Teenager
  Sham Real Sham Real Sham Real Sham Real Sham Real Sham Real
Stage: mean (standard error)           
I 78.7 (2.1) 78.2 (2.1) 81.9 (1.4) 80.9 (1.8) 18.4 (0.4) 18.4 (0.5) 17.9 (0.5) 18.6 (0.5) 100.0 (0.0) 100.0 (0.0) 100.0 (0.0) 100.0 (0.0)
II 78.0 (2.1) 76.6 (1.9) 82.0 (1.4) 80.8 (1.6) 18.9 (0.4) 18.2 (0.4) 18.1 (0.5) 18.2 (0.4) 144.9 (11.9) 156.3 (19.5) 129.3 (15.3) 142.4 (16.7)
III 76.7 (2.1) 77.0 (2.0) 80.7 (1.3) 80.9 (1.4) 18.6 (0.4) 18.5 (0.4) 18.0 (0.5) 18.4 (0.4) 148.0 (16.5) 175.8 (21.2) 156.5 (20.4) 166.5 (22.9)
IV 78.3 (2.1) 76.9 (1.9) 81.2 (1.4) 80.6 (1.4) 19.2 (0.4) 18.5 (0.4) 18.5 (0.5) 18.6 (0.4) 178.0 (21.8) 148.2 (9.9) 177.0 (22.8) 157.0 (22.9)
Factor (P-value)           
Exposure 0.623 0.487 0.115 0.135 0.883 0.965
Stage 0.075 0.669 0.130 0.165 < 0.001* < 0.001*
Interaction (exposure and stage) 0.318 0.376 0.323 0.102 0.180 0.570
  1. * P < 0.05, bpm; beats per min.
  2. LFP/HFP; 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.