Day workers | Shift workers | p Value | |
Population characteristics: | |||
n | 32 | 75 | |
Age (y, mean (SD)) | 29.3 (5.3) | 30.4 (6.7) | 0.4 |
Sex (% female) | 9 | 11 | 0.81-150 |
Smoking habits (%): | |||
Never smoker | 48 | 41 | 0.41-150 |
Current smoker | 26 | 40 | |
Ex-smoker | 26 | 19 | |
Education (%): | |||
Low | 3 | 38 | 0.0011-150 |
Intermediate | 35 | 44 | |
High | 61 | 18 | |
Baseline frequency of premature complexes: | |||
PAC (beats/h, median) | 0.54 | 0.47 | NA |
PAC (respondents with >1/h, %) | 30.9 | 38.7 | 0.41-151 |
PVC (beats/h, median) | 0.043 | 0.042 | NA |
PVC (respondents with >0.1/h, %) | 25.8 | 23.4 | 0.81-151 |
Baseline heart rate variability: | |||
Heart rate (beats/min) | 71.6 (8.4) | 75.3 (8.4) | 0.04 |
SDNNi (ms) | 89.1 (28.7) | 74.6 (20.7) | 0.01 |
Loglow (log ms) | −2.67 (0.18) | −2.76 (0.21) | 0.03 |
Loghigh (log ms) | −2.98 (0.35) | −3.15 (0.30) | 0.03 |
% lf | 65.1 (10.8) | 68.4 (8.1) | 0.2 |
↵1-150 p value by χ2 test.
↵1-151 p value by Wilcoxon two sample test.
PAC=premature atrial complexes; PVC=premature ventricular complexes; SDNNi=mean of all 5 minute SDs of NN intervals; Loglow=power in the low frequency range (0.05–015 Hz) in logarithmic units; Loghigh=power in the high frequency range (0.15–0.40 Hz) in logarithmic units; % lf=low frequency power (0.05–0.15 Hz) in normalised units.