Linkage of MomConnect enrolees to other routine clinical data on pregnancies
| Total | 2014 | 2015 | 2016 | 2017 | |
| Total records | 97 743 | 2639 | 28 344 | 45 951 | 21 800 |
| Total linked records | 71 512 (73.2%) | 1984 (75.2%) | 21 612 (76.3%) | 32 697 (71.2%) | 15 219 (69.8%) |
| Number of individuals | 65 073 | 1828 | 19 678 | 29 826 | 13 741 |
| Duplicate records (%) | 9.9 | 8.7 | 9.7 | 9.8 | 10.6 |
| Probable linkages* | 69 217 (70.8%) | 1934 (73.3%) | 21 133 (74.6%) | 31 764 (69.1%) | 14 386 (66.0%) |
| Probable linkage categories | |||||
| SA ID, other evidence | 60 142 (84.1%) | 1914 (96.5%) | 18 641 (86.3%) | 27 599 (84.4%) | 11 988 (78.8%) |
| DOB, pregnancy, mobile phone | 2126 (3.0%) | 8 (0.4%) | 728 (3.4%) | 945 (2.9%) | 445 (2.9%) |
| DOB, pregnancy, mobile phone, encounter | 1483 (2.1%) | 2 (0.1%) | 542 (2.5%) | 650 (2.0%) | 289 (1.9%) |
| DOB, pregnancy, encounter | 4024 (5.6%) | 4 (0.2%) | 911 (4.22%) | 2063 (6.3%) | 1046 (6.9%) |
| DOB, mobile phone | 785 (1.1%) | 3 (0.2%) | 142 (0.7%) | 280 (0.9%) | 360 (2.4%) |
| DOB, mobile phone, encounter | 376 (0.5%) | – | 80 (0.4%) | 106 (0.3%) | 190 (1.3%) |
| YOB, pregnancy, mobile phone | 159 (0.2%) | 1 (0.1%) | 58 (0.3%) | 70 (0.2%) | 30 (0.2%) |
| YOB, pregnancy, mobile phone, encounter | 97 (0.1%) | 2 (0.1%) | 28 (0.1%) | 42 (0.1%) | 25 (0.2%) |
| YOB, contact, encounter | 24 (0.0%) | – | 3 (0.0%) | 8 (0.0%) | 13 (0.1%) |
| Possible linkage categories | |||||
| DOB, encounter, sex | 1189 (1.7%) | 3 (0.2%) | 178 (0.8%) | 333 (1.0%) | 675 (4.4%) |
| Mobile phone, pregnancy | 527 (0.7%) | 19 (1.0%) | 136 (0.6%) | 309 (1.0%) | 63 (0.4%) |
| Mobile phone, encounter, pregnancy | 352 (0.5%) | 12 (0.6%) | 116 (0.5%) | 196 (0.6%) | 28 (0.2%) |
| Mobile phone, encounter | 86 (0.1%) | 15 (0.8%) | 20 (0.1%) | 37 (0.1%) | 14 (0.1%) |
| Mobile phone, YOB | 79 (0.1%) | 1 (0.1%) | 16 (0.1%) | 34 (0.1%) | 28 (0.2%) |
| DOB, encounter | 63 (0.1%) | – | 13 (0.1%) | 25 (0.1%) | 25 (0.2%) |
| Facility type | |||||
| National central hospital | 977 (92.4%) | – | 306 (95.0%) | 557 (90.3%) | 114 (96.6%) |
| Regional hospital | 311 (64.8%) | 2 (100%) | 227 (70.7%) | 70 (61.4%) | 12 (27.9%) |
| District hospital | 1511 (67.2%) | 34 (66.7%) | 613 (76.8%) | 598 (66.7%) | 266 (52.9%) |
| Clinic | 67 366 (73.4%) | 1857 (79.0%) | 20 037 (77.9%) | 30 959 (71.8%) | 14 513 (70.5%) |
| Satellite clinic | 974 (65.5%) | 41 (75.9%) | 343 (69.9%) | 406 (63.5%) | 184 (60.5%) |
| Mobile service | 288 (48.9%) | 50 (65.8%) | 86 (52.4%) | 107 (46.5%) | 45 (37.8%) |
| Facility authority | |||||
| Provincial government | 65 922 (73.9%) | 1946 (78.5%) | 20 702 (77.9%) | 29 930 (72.5%) | 13 414 (70.8%) |
| City of Cape Town | 520 (65.3%) | 38 (70.4%) | 910 (71.8%) | 2767 (64.0%) | 1805 (64.3%) |
| PMI site† | |||||
| PMI site | 69 109 (73.5%) | 1887 (79.3%) | 20 938 (78.2%) | 31 870 (72.0%) | 14 414 (70.0%) |
| Non-PMI site | 2403 (64.7%) | 97 (63.4%) | 674 (63.9%) | 827 (62.1%) | 805 (68.4%) |
| Metro/outside metro | |||||
| Metro | 43 104 (76.1%) | 815 (76.5%) | 13 065 (78.4%) | 20 302 (75.2%) | 8922 (75.0%) |
| Outside of the metro | 28 408 (67.5%) | 1169 (74.3%) | 8547 (73.3%) | 12 395 (65.5%) | 6297 (63.6%) |
| Age category at registration (years) | |||||
| Median (IQR) age | 26.7 (22.8–31.5) | ||||
| <20 | 6958 (60.3%) | 167 (83.9%) | 2179 (65.0%) | 3207 (59.4%) | 1405 (54.1%) |
| 20–24 | 21 250 (74.8%) | 618 (88.5%) | 6734 (80.3%) | 9483 (73.4%) | 4415 (68.9%) |
| 25–29 | 20 519 (77.2%) | 612 (93.0%) | 6283 (81.2%) | 9249 (75.8%) | 4375 (73.1%) |
| 30–34 | 14 185 (78.7%) | 366 (93.1%) | 4109 (82.4%) | 6621 (78.3%) | 3089 (73.8%) |
| 35–39 | 6496 (79.6%) | 145 (98.0%) | 1711 (81.2%) | 3034 (79.0%) | 1606 (77.8%) |
| 40–44 | 1471 (79.5%) | 31 (93.9%) | 413 (82.1%) | 727 (80.5%) | 300 (72.8%) |
| >44 | 97 (69.3%) | – | 29 (63.0%) | 48 (70.6%) | 20 (76.9%) |
| Data not available | 536 (17.7%) | 45 (11.1%) | 154 (21.6%) | 328 (17.9%) | 9 (11.7%) |
| Gestational age at registration (weeks) | |||||
| Median (IQR) | 19.9 (12.9–28.1) | ||||
| 0–13 | 20 529 (74.4%) | 256 (91.4%) | 4925 (78.9%) | 10 142 (73.7%) | 5206 (71.3%) |
| 14–19 | 14 721 (74.4%) | 230 (92.0%) | 3862 (78.9%) | 7167 (72.9%) | 3462 (72.2%) |
| 20– 31 | 23 343 (72.9%) | 759 (92.3%) | 7578 (78.6%) | 10 275 (70.7%) | 4731 (60.7%) |
| ≥32 | 11 879 (72.4%) | 663 (90.5%) | 4887 (77.0%) | 4641 (69.0%) | 1688 (64.9%) |
| Registered after EDD | 822 (62.3%) | 30 (88.2%) | 310 (74.0%) | 395 (60.2%) | 87 (41.4%) |
| >40 before EDD | 175 (75.4%) | 3 (100%) | 50 (74.6%) | 77 (72.0%) | 45 (81.8%) |
| Invalid EDD | 43 (10.4%) | 43 (10.5%) | 0 (0%) | – | – |
*Probable linkage means that the linkage is highly likely to be correct. Possible linkage means that the linkage is fairly likely to be correct.
†PMI site: site assigning and using Clinicom folder numbers.
DOB, date of birth; EDD, estimated delivery date; PMI, Patient Master Index; SA ID, South African national identification number; YOB, year of birth.