Table 4.
Univariate analysis of the occurrence of atrial fibrillation.
| Variable | HR (95% CI) | P value |
|---|---|---|
| Age | 1.050 (1.018–1.082) | 0.002 |
| Female gender | 0.841 (0.463–1.527) | 0.569 |
| DM | 1.490 (0.812–2.733) | 0.198 |
| CAD | 2.219 (1.142–4.309) | 0.019 |
| CKD | 1.540 (0.550–4.310) | 0.411 |
| Hemodialysis | 6.298 (1.934–20.057) | 0.002 |
| History of CVA | 1.467 (0.705–3.054) | 0.306 |
| Acute CVA | 0.622 (0.307–1.260) | 0.188 |
| Chronic heart failure | 2.700 (1.064–6.853) | 0.037 |
| Acute heart failure | 3.257 (0.788–13.464) | 0.103 |
| History of AF | 9.921 (5.478–17.969) | < 0.001 |
| VLF | 1.019 (1.007–1.032) | 0.002 |
| LF | 1.031 (1.015–1.047) | < 0.001 |
| HF | 1.076 (1.044–1.108) | < 0.001 |
| LF/HF ratio | 0.509 (0.242–1.070) | 0.075 |
| SDNN | 1.004 (0.998–1.010) | 0.208 |
| ASDNN | 1.017 (1.008–1.025) | < 0.001 |
| rMSSD | 1.036 (1.023–1.049) | < 0.001 |
| pNN50 | 1.057 (1.035–1.080) | < 0.001 |
| BB50 | 1.000 (1.000–1.000) | 0.003 |
| Mean heart rate | 0.960 (0.935–0.986) | 0.003 |
| PAC counts | 1.000 (1.000–1.000) | < 0.001 |
DM, diabetes mellitus; CKD, chronic kidney disease; CAD, coronary artery disease; CVA, cerebrovascular accident; VLF, very low frequency; LF, low frequency; HF, high frequency; SDNN, standard deviation of the NN interval; ASDNN, average standard deviation of all 5-min RR intervals; rMSSD, square root of the mean squared differences of successive NN interval; pNN50, the percentage of RR intervals that are more than 50 ms different from the previous interval; BB50, the count of intervals that are more than 50 ms different from the previous interval.