Table 2.
Variables | Smokers (n = 75) | Nonsmokers (n = 73) | P |
---|---|---|---|
SDNN | 54.2 ± 31 | 138.2 ± 61.7 | <0.0001 |
SDANN | 45.3 ± 20.2 | 116.6 ± 46.2 | <0.0001 |
RMSSD | 36.9 ± 18.1 | 48.7 ± 30.8 | 0.006 |
LF day | 1520 ± 506 | 505 ± 431 | <0.0001 |
LF night | 1087 ± 416 | 543 ± 127 | <0.0001 |
LF 24 hours | 1313 ± 467 | 428 ± 325 | <0.0001 |
HF day | 263 ± 102 | 448 ± 404 | <0.0001 |
HF night | 319 ± 113 | 616 ± 138 | 0.003 |
HF 24 hours | 278 ± 98 | 438 ± 154 | 0.005 |
LF/HF day | 6.4 ± 3.0 | 1.4 ± 1.2 | <0.0001 |
LF/HF night | 3.6 ± 1.5 | 1.0 ± 1.2 | <0.0001 |
LF/HF 24 hours | 4.9 ± 1.9 | 1.2 ± 0.7 | <0.0001 |
SDNN = standard deviation of all NN intervals; SDANN = standard deviation of the 5‐minute mean RR intervals; RMSSD = root mean square of successive differences; LF = low frequency; HF = high frequency.