| Variable | No. of patients | Unadjusted prevalence ratio | Adjusted prevalence ratio† (95% CI) | ||
|---|---|---|---|---|---|
| All | With hypertension | Without hypertension | |||
| Location | |||||
| Urban | 188 076 | 42 448 | 146 628 | 1.00 | 1.00 (ref) |
| Rural | 54 403 | 14 494 | 39 909 | 1.21 | 1.24 (1.19–1.30) |
| Missing data | 7 867 | 1 238 | 6 629 | 0.71 | 0.95 (0.82–1.11) |
| BMI | |||||
| 18–24 (normal) | 52 989 | 11 286 | 41 703 | 1.00 | 1.00 (ref) |
| < 18 (underweight) | 7 745 | 1 795 | 5 950 | 1.09 | 1.13 (0.95–1.35) |
| 25–29 (overweight) | 51 433 | 13 769 | 37 664 | 1.26 | 1.51 (1.38–1.64) |
| ≥ 30 (obese) | 47 510 | 14 785 | 32 725 | 1.46 | 2.42 (2.22–2.63) |
| Missing data | 90 669 | 15 545 | 75 124 | 0.81 | 0.99 (0.91–1.08) |
| Smoking status | |||||
| Never smoked | 62 020 | 14 284 | 47 736 | 1.00 | 1.00 (ref) |
| Current smoker | 17 629 | 3 679 | 13 308 | 0.91 | 1.01 (0.89–1.15) |
| Past smoker | 20 024 | 6 716 | 13 308 | 1.46 | 1.94 (1.73–2.16) |
| Missing data | 150 673 | 32 501 | 118 172 | 0.94 | 1.50 (1.40–1.61) |
Note: CI = confidence interval, ref = reference category. *Missing data included as a group in the models. Because of the large amount of missing data, especially for BMI and smoking status, we included people with missing data as a group in each variable when calculating prevalence ratios. †Log-binomial regression. Along with 5 main effect variables (age, sex, location, BMI and smoking status), the model also included 8 interaction terms: age*sex, age*BMI, sex*BMI, age*smoking, sex*smoking, location*BMI, location*smoking, and BMI*smoking. Only the effects of location, BMI and smoking status are reported in this table.