Table 2. The risk of atrial fibrillation incidence according to the metabolic status and body mass index categories.
| Metabolically healthy | Metabolically unhealthy | ||||
|---|---|---|---|---|---|
| Variables | Underweight | Normal weight | Overweight/obese | Underweight | Normal weight |
| Participants | 205 | 1483 | 493 | 156 | 1,678 |
| Person-years | 2734.23 | 19870.66 | 6570.05 | 1,932.74 | 2,1281.12 |
| Events | 1 | 10 | 9 | 1 | 65 |
| Incidence rate | 0.37 | 0.50 | 1.37 | 0.52 | 3.05 |
| Hazard ratio (95% CI) | |||||
| Model 1a | 1.34 [0.17–10.46] | 1 (reference) | 2.04 [0.83–5.02] | 0.61 [0.08–4.81] | 2.70 [1.38, 5.29]* |
| Model 2b | 1.33 [0.17–10.45] | 1 (reference) | 2.00 [0.81–4.93] | 0.60 [0.08–4.74] | 2.70 [1.38, 5.29]* |
| Model 3c | 1.30 [0.17–10.20] | 1 (reference) | 1.97 [0.80–4.86] | 0.60 [0.08–4.68] | 2.64 [1.34, 5.17]* |
Notes:
Incidence rates are presented per 1,000 person-years; *Data are statistically significant (p < 0.05).
Body mass index categories: Underweight, <18.5 kg/m2; Normal weight, 18.5 to 23.9 kg/m2; Overweight, 24.0 to 26.9 kg/m2; obese, ≥27.0 kg/m2.
Abbreviations: CI, confidence interval.
a, adjusted for sex, age; b, adjusted for sex, age, smoker, alcohol, regular exercise habit; c, adjusted for sex, age, smoker, alcohol, regular exercise habit, marital status, education, income.
Covariates: Current smokers: smoking in the recent 1 month; Alcohol use: The answer to ‘Do you drink alcohol?’ is ‘yes’; Regular exercise habit: at least three times a week for at least 30 min for a period of more than 3 months; Living with spouse: Married, and living with a spouse, cohabitation; Educational level: ≥9 years of schooling; Income: Average month income ≥40,000 (New Taiwanese Dollar).