Table 1.
Baseline characteristics by continuity of care quartiles after multiple imputation and weighting
| Characteristic | Total (N = 421 545) | Quartile | SMDa | |||
|---|---|---|---|---|---|---|
| UPCI <0.50 (N = 100 915) | UPCI 0.50–0.70 (N = 107 971) | UPCI 0.71–0.91 (N = 103 487) | UPCI 0.92–1.00 (N = 109 172) | |||
| Sex, male, n (%) | 183 050 (43.4) | 43 966 (43.6) | 47 071 (43.6) | 44 917 (43.4) | 47 097 (43.1) | <0.01 |
| Age, years, mean (SD) | 64.0 (12.2) | 63.8 (12.1) | 63.9 (12.3) | 64.2 (12.0) | 64.2 (12.2) | 0.03 |
| Smoker, n (%) | 22 692 (5.4) | 5434 (5.4) | 5602 (5.2) | 5592 (5.4) | 6064 (5.6) | 0.02 |
| SBP, mmHg, mean (SD) | 134.6 (15.8) | 134.7 (16.1) | 134.4 (15.9) | 134.6 (15.5) | 134.7 (15.5) | 0.02 |
| DBP, mmHg, mean (SD) | 76.3 (10.6) | 76.5 (10.7) | 76.3 (10.7) | 76.3 (10.4) | 76.3 (10.5) | 0.02 |
| Fasting glucose, mmol/L, mean (SD) | 5.3 (0.6) | 5.3 (0.6) | 5.3 (0.6) | 5.3 (0.6) | 5.3 (0.5) | <0.01 |
| BMI, kg/m2, mean (SD) | 25.2 (3.8) | 25.2 (3.8) | 25.2 (3.9) | 25.1 (3.8) | 25.1 (3.9) | <0.01 |
| LDL-C, mmol/L, mean (SD) | 3.2 (0.8) | 3.2 (0.8) | 3.2 (0.8) | 3.2 (0.8) | 3.2 (0.8) | <0.01 |
| eGFR, ml/min/1.73m2, mean (SD) | 102.5 (63.3) | 102.8 (29.4) | 102.4 (29.6) | 102.4 (72.8) | 102.5 (93.8) | 0.01 |
| CCI, mean (SD) | 3.4 (2.8) | 3.4 (2.8) | 3.4 (2.8) | 3.4 (2.8) | 3.4 (2.8) | 0.02 |
| Use of anti-hypertensive drugs, n (%) | 401 385 (95.2) | 96 485 (95.6) | 103 371 (95.7) | 98 440 (95.1) | 103 088 (94.4) | 0.06 |
| Use of lipid-lowering agents, n (%) | 40 622 (9.6) | 9741 (9.7) | 10 459 (9.7) | 9977 (9.6) | 10 445 (9.6) | <0.01 |
| Number of appointments, mean (SD) | 11.7 (4.9) | 11.7 (5.5) | 11.7 (4.9) | 11.8 (4.4) | 11.7 (4.6) | 0.02 |
| UPCI, mean (SD) | 0.69 (0.24) | 0.36 (0.08) | 0.58 (0.06) | 0.80 (0.06) | 0.98 (0.03) | NA |
a
Standardised mean difference (SMD) listed is the largest SMD between any pairs of the groups. BMI = body mass index. CCI = Charlson comorbidity index. DBP = diastolic blood pressure. eGFR = estimated glomerular filtration rate. LDL-C = low-density lipoprotein — cholesterol. NA = not applicable. SBP = systolic blood pressure. SD = standard deviation. UPCI = usual provider of care index.