Patient/site characteristics and BP measurements ending in zero for both systolic BP and diastolic BP in Canada (CPCSSN) and the UK (RCGP RSC database)
| Characteristics | Canada | UK | ||||
| Number of patients (% of patients) | Number of BPs (% of BPs) | Number of BPs with both systolic and diastolic BP ending in zero (% with both ending in zero) | Number of patients (% of patients) | Number of BPs (% of BPs) | Number of BPs with both systolic and diastolic BP ending in zero (% with both ending in zero) | |
| Total | 707 227 | 5 503 663 | 1 044 031 (19.0%) | 1 558 471 | 13 424 678 | 2 674 497 (19.9%) |
| Age (years) | ||||||
| 18–39 | 189 254 (26.8) | 816 136 (14.8) | 165 025 (20.2) | 531 632 (34.1) | 2 330 344 (17.4) | 538 786 (23.1) |
| 40–59 | 247 771 (35) | 1 534 126 (27.9) | 292 435 (19.1) | 498 272 (32.0) | 3 298 174 (24.6) | 631 260 (19.1) |
| 60–79 | 201 364 (28.5) | 2 115 655 (38.4) | 377 724 (17.9) | 352 483 (22.6) | 4 879 583 (36.3) | 868 894 (17.8) |
| 80+ | 68 838 (9.7) | 1 037 716 (18.9) | 208 847 (20.1) | 176 084 (11.3) | 2 916 577 (21.7) | 635 557 (21.8) |
| Sex | ||||||
| Female | 414 644 (58.6) | 3 325 256 (60.4) | 648 357 (19.5) | 901 866 (57.9) | 8 133 678 (60.6) | 1 708 742 (21.0) |
| Male | 292 583 (41.4) | 2 178 377 (39.6) | 395 674 (18.2) | 656 605 (42.13) | 5 291 000 (39.4) | 965 755 (18.3) |
| BMI range | ||||||
| Underweight (BMI<18.5) | 10 233 (1.4) | 70 776 (1.3) | 14 649 (20.7) | 44 654 (2.9) | 308 481 (2.3) | 71 234 (23.1) |
| Normal weight (18.5–24.9) | 170 684 (24.1) | 1 177 970 (21.4) | 236 883 (20.1) | 560 214 (36.0) | 4 071 114 (30.3) | 852 192 (20.9) |
| Overweight (25–29.9) | 182 141 (25.8) | 1 545 777 (28.1) | 283 163 (18.3) | 446 850 (28.7) | 4 412 326 (32.9) | 842 338 (19.1) |
| Obesity class I (30–34.9) | 101 980 (14.4) | 1 013 286 (18.4) | 175 781 (17.3) | 200 761 (12.9) | 2 421 241 (18.0) | 455 572 (18.8) |
| Obesity class II (35–39.9) | 42 235 (6.0) | 468 239 (8.5) | 77 408 (16.5) | 71 450 (4.6) | 928 259 (6.9) | 176 969 (19.1) |
| Obesity class III (> 40) | 27 451 (3.9) | 320 682 (5.8) | 52 327 (16.3) | 37 370 (2.4) | 491 533 (3.7) | 96 589 (19.7) |
| Not available | 172 503 (24.4) | 906 903 (16.5) | 203 820 (22.5) | 197 172 (12.7) | 791 724 (5.9) | 179 603 (22.7) |
| Diabetes | ||||||
| Yes | 86 103 (12.2) | 1 299 693 (23.6) | 233 944 (18) | 65 335 (4.2) | 1 909 804 (14.2) | 359 324 (18.8) |
| No | 621 124 (87.8) | 4 203 940 (76.4) | 810 087 (19.3) | 1 493 136 (95.1) | 11 514 874 (85.8) | 2 315 173 (20.1) |
| Hypertension | ||||||
| Yes | 185 508 (26.2) | 2 704 921 (49.1) | 486 787 (18) | 235 716 (15.1) | 6 359 131 (47.4) | 1 141 665 (18.0) |
| No | 521 719 (73.8) | 2 798 712 (50.9) | 557 244 (19.9) | 1 322 755 (84.9) | 7 065 547 (52.6) | 1 532 832 (21.7) |
| Hypertension medications | ||||||
| Yes | 125 484 (17.7) | 2 704 947 (49.1) | 395 371 (17.7) | 466 800 (30.0) | 8 327 009 (62.0) | 1 571 464 (18.9) |
| No | 581 743 (82.3) | 2 798 686 (50.9) | 648 660 (19.8) | 1 091 671 (70.1) | 5 097 669 (38.0) | 1 103 033 (21.6) |
| Practice site size | ||||||
| First quartile (smallest site) | 36 363 (5.1) | 249 957 (4.5) | 63 781 (25.5) | 173 610 (11.1) | 1 671 387 (12.5) | 303 084 (18.1) |
| Second quartile | 77 776 (11) | 584 575 (10.6) | 110 411 (18.9) | 305 460 (19.6) | 2 836 288 (21.1) | 480 604 (16.9) |
| Third quartile | 156 601 (22.1) | 1 156 892 (21.0) | 228 521 (19.8) | 416 580 (26.7) | 3 774 278 (28.1) | 846 481 (22.4) |
| Fourth quartile (largest site) | 436 487 (61.7) | 3 512 209 (63.8) | 641 318 (18.3) | 662 821 (42.5) | 5 142 725 (38.3) | 1 044 328 (20.3) |
| Measurement year* | ||||||
| 2006 | 52 168 (7.4) | 121 355 (2.2) | 32 335 (26.6) | 542 695 (34.8) | 1 347 400 (10.0) | 325 843 (24.2) |
| 2007 | 81 699 (11.6) | 183 591 (3.3) | 49 030 (26.7) | 553 033 (35.5) | 1 342 979 (10.1) | 303 477 (22.6) |
| 2008 | 125 781 (17.8) | 277 858 (5.0) | 72 772 (26.2) | 563 222 (36.1) | 1 353 092 (10.1) | 288 418 (21.3) |
| 2009 | 167 345 (23.7) | 368 245 (6.7) | 94 871 (25.8) | 572 940 (36.8) | 1 358 664 (10.1) | 278 829 (20.5) |
| 2010 | 213 250 (30.2) | 531 316 (9.7) | 117 612 (22.1) | 580 069 (37.2) | 1 340 279 (10.0) | 266 242 (19.9) |
| 2011 | 263 691 (37.3) | 615 364 (11.2) | 125 282 (20.4) | 590 921 (37.9) | 1 354 956 (10.1) | 257 309 (19.0) |
| 2012 | 299 590 (42.4) | 700 903 (12.7) | 128 192 (18.3) | 602 642 (38.7) | 1 347 042 (10.0) | 249 344 (18.5) |
| 2013 | 332 809 (47.1) | 813 009 (14.8) | 133 434 (16.4) | 617 073 (39.6) | 1 366 085 (10.2) | 246 754 (18.1) |
| 2014 | 360 180 (50.9) | 894 350 (16.3) | 137 181 (15.3) | 612 382 (39.3) | 1 325 141 (9.9) | 235 377 (17.8) |
| 2015 | 386 541 (54.7) | 997 642 (18.1) | 153 322 (15.4) | 594 589 (38.2) | 1 289 040 (9.6) | 222 904 (17.3) |
*Considering repeated measurements of BP for each patient with respect to measurement year.
BP, blood pressure; BMI, body mass index (weight in kg/height in m2); CPCSSN, Canadian Primary Care Sentinel Surveillance Network; RCGP, Royal College of General Practitioners; RSC, Research and Surveillance Centre.