| Factor | No. of patients | Prevalence ratio (95% CI) |
|---|---|---|
| Residence location | ||
| Urban | 42 940 | 1.00 (ref) |
| Rural | 14 438 | 0.93 (0.87-1.00) |
| Missing data | 1 799 | 1.50 (1.36-1.67) |
| Weight category (BMI) | ||
| Normal (18-24) | 12 246 | 1.00 (ref) |
| Underweight (< 18) | 1 552 | 1.13 (0.98-1.33) |
| Overweight (25-29) | 14 510 | 0.94 (0.87-1.03) |
| Obese (≥ 30) | 12 843 | 0.89 (0.81-0.97) |
| Missing data | 18 026 | 1.03 (0.96-1.11) |
| Comorbidity | ||
| Hypertension | 30 691 | 0.97 (0.95-1.00) |
| Diabetes | 13 130 | 1.10 (1.04-1.16) |
| Depression | 9 355 | 2.40 (2.29-2.52) |
| COPD | 6 704 | 1.08 (1.00-1.17) |
| Osteoarthritis | 17 028 | 1.01 (0.97-1.06) |
| Epilepsy | 592 | 2.89 (2.32-3.60) |
| Parkinsonism | 794 | 2.93 (2.47-3.47) |
Note: BMI = body mass index, CI = confidence interval, COPD = chronic obstructive pulmonary disorder, ref = reference group.