Table 2

Linkage of MomConnect enrolees to other routine clinical data on pregnancies

Total2014201520162017
Total records97 743263928 34445 95121 800
 Total linked records71 512 (73.2%)1984 (75.2%)21 612 (76.3%)32 697 (71.2%)15 219 (69.8%)
 Number of individuals65 073182819 67829 82613 741
 Duplicate records (%)9.98.79.79.810.6
 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 evidence60 142 (84.1%)1914 (96.5%)18 641 (86.3%)27 599 (84.4%)11 988 (78.8%)
 DOB, pregnancy, mobile phone2126 (3.0%)8 (0.4%)728 (3.4%)945 (2.9%)445 (2.9%)
 DOB, pregnancy, mobile phone, encounter1483 (2.1%)2 (0.1%)542 (2.5%)650 (2.0%)289 (1.9%)
 DOB, pregnancy, encounter4024 (5.6%)4 (0.2%)911 (4.22%)2063 (6.3%)1046 (6.9%)
 DOB, mobile phone785 (1.1%)3 (0.2%)142 (0.7%)280 (0.9%)360 (2.4%)
 DOB, mobile phone, encounter376 (0.5%)80 (0.4%)106 (0.3%)190 (1.3%)
 YOB, pregnancy, mobile phone159 (0.2%)1 (0.1%)58 (0.3%)70 (0.2%)30 (0.2%)
 YOB, pregnancy, mobile phone, encounter97 (0.1%)2 (0.1%)28 (0.1%)42 (0.1%)25 (0.2%)
 YOB, contact, encounter24 (0.0%)3 (0.0%)8 (0.0%)13 (0.1%)
Possible linkage categories
 DOB, encounter, sex1189 (1.7%)3 (0.2%)178 (0.8%)333 (1.0%)675 (4.4%)
 Mobile phone, pregnancy527 (0.7%)19 (1.0%)136 (0.6%)309 (1.0%)63 (0.4%)
 Mobile phone, encounter, pregnancy352 (0.5%)12 (0.6%)116 (0.5%)196 (0.6%)28 (0.2%)
 Mobile phone, encounter86 (0.1%)15 (0.8%)20 (0.1%)37 (0.1%)14 (0.1%)
 Mobile phone, YOB79 (0.1%)1 (0.1%)16 (0.1%)34 (0.1%)28 (0.2%)
 DOB, encounter63 (0.1%)13 (0.1%)25 (0.1%)25 (0.2%)
Facility type
 National central hospital977 (92.4%)306 (95.0%)557 (90.3%)114 (96.6%)
 Regional hospital311 (64.8%)2 (100%)227 (70.7%)70 (61.4%)12 (27.9%)
 District hospital1511 (67.2%)34 (66.7%)613 (76.8%)598 (66.7%)266 (52.9%)
 Clinic67 366 (73.4%)1857 (79.0%)20 037 (77.9%)30 959 (71.8%)14 513 (70.5%)
 Satellite clinic974 (65.5%)41 (75.9%)343 (69.9%)406 (63.5%)184 (60.5%)
 Mobile service288 (48.9%)50 (65.8%)86 (52.4%)107 (46.5%)45 (37.8%)
Facility authority
 Provincial government65 922 (73.9%)1946 (78.5%)20 702 (77.9%)29 930 (72.5%)13 414 (70.8%)
 City of Cape Town520 (65.3%)38 (70.4%)910 (71.8%)2767 (64.0%)1805 (64.3%)
PMI site†
 PMI site69 109 (73.5%)1887 (79.3%)20 938 (78.2%)31 870 (72.0%)14 414 (70.0%)
 Non-PMI site2403 (64.7%)97 (63.4%)674 (63.9%)827 (62.1%)805 (68.4%)
Metro/outside metro
 Metro43 104 (76.1%)815 (76.5%)13 065 (78.4%)20 302 (75.2%)8922 (75.0%)
 Outside of the metro28 408 (67.5%)1169 (74.3%)8547 (73.3%)12 395 (65.5%)6297 (63.6%)
Age category at registration (years)
 Median (IQR) age26.7 (22.8–31.5)
 <206958 (60.3%)167 (83.9%)2179 (65.0%)3207 (59.4%)1405 (54.1%)
 20–2421 250 (74.8%)618 (88.5%)6734 (80.3%)9483 (73.4%)4415 (68.9%)
 25–2920 519 (77.2%)612 (93.0%)6283 (81.2%)9249 (75.8%)4375 (73.1%)
 30–3414 185 (78.7%)366 (93.1%)4109 (82.4%)6621 (78.3%)3089 (73.8%)
 35–396496 (79.6%)145 (98.0%)1711 (81.2%)3034 (79.0%)1606 (77.8%)
 40–441471 (79.5%)31 (93.9%)413 (82.1%)727 (80.5%)300 (72.8%)
 >4497 (69.3%)29 (63.0%)48 (70.6%)20 (76.9%)
 Data not available536 (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 EDD822 (62.3%)30 (88.2%)310 (74.0%)395 (60.2%)87 (41.4%)
 >40 before EDD175 (75.4%)3 (100%)50 (74.6%)77 (72.0%)45 (81.8%)
 Invalid EDD43 (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.