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Table 3 Consistency of reporting of anaemia and blood related disorders in coded hospital data compared to obstetric data (ObstetriX) from two tertiary hospitals, New South Wales, 2011–2015, by pregnancy characteristics

From: Validation of anaemia, haemorrhage and blood disorder reporting in hospital data in New South Wales, Australia

Condition Characteristic Value Source of identification of condition NPV (95% CI)
ObstetriX data Coded hospital data Sensitivity (95% CI) Specificity (95% CI) PPV (95% CI)
Anaemia (nutritional or haemolytic) Overall   1530 1425 13.5 (11.8–15.3) 96.5 (96.3–96.7) 14.5 (12.7–16.4) 96.2 (96.0–96.4)
  Parity Nulliparous 758 809 13.2 (10.9–15.8) 95.6 (95.3–95.9) 12.4 (10.2–14.8) 95.9 (95.6–96.2)
   Parous 766 607 13.7 (11.4–16.3) 97.3 (97.0–97.5) 17.3 (14.4–20.5) 96.4 (96.1–96.7)
  Birth year 2011 262 176 8.0 (5.0–12.0) 97.7 (97.3–98.0) 11.9 (7.5–17.7) 96.4 (96.0–96.9)
   2012 263 146 7.6 (4.7–11.5) 98.2 (97.8–98.5) 13.7 (8.6–20.4) 96.5 (96.1–96.9)
   2013 281 259 11.7 (8.2–16.1) 96.7 (96.2–97.1) 12.7 (8.9–17.4) 96.3 (95.9–96.8)
   2014 355 455 22.0 (17.8–26.6) 94.8 (94.3–95.3) 17.1 (13.8–20.9) 96.1 (95.6–96.6)
   2015 369 389 14.6 (11.2–18.7) 95.2 (94.7–95.7) 13.9 (10.6–17.7) 95.5 (95.0–96.0)
  Model of care Hospital medical a 625 642 18.2 (15.3–21.5) 96.1 (95.7–96.4) 17.8 (14.9–20.9) 96.2 (95.8–96.5)
   Midwife a 820 687 9.5 (7.6–11.7) 96.6 (96.3–96.9) 11.4 (9.1–14.0) 95.9 (95.6–96.2)
   Private obstetrician or GP only 81 91 17.3 (9.8–27.3) 97.5 (96.9–98.0) 15.4 (8.7–24.5) 97.8 (97.3–98.3)
  Transfusion status Transfused 50 382 82.0 (68.6–91.4) 35.0 (31.0–39.3) 10.7 (7.8–14.3) 95.3 (91.3–97.8)
   Not transfused 1480 1043 11.1 (9.6–12.9) 97.4 (97.2–97.6) 15.8 (13.7–18.2) 96.2 (96.0–96.4)
PPH Overall   4330 4001 82.8 (81.6–83.9) 98.7 (98.6–98.8) 89.6 (88.6–90.5) 97.7 (97.5–97.8)
  Transfusion status Transfused 482 456 88.8 (85.6–91.5) 69.9 (59.5–79.0) 93.9 (91.2–95.9) 54.6 (45.2–63.8)
   Not transfused 3848 3545 82.0 (80.8–83.2) 98.8 (98.6–98.9) 89.1 (88.0–90.1) 97.8 (97.7–98.0)
IPH Overall   155 130 41.9 (34.1–50.1) 99.8 (99.8–99.9) 50.0 (41.1–58.9) 99.7 (99.7–99.8)
  Transfusion status Transfused 12 13 25.0 (5.5–57.2) 98.2 (96.8–99.1) 23.1 (5.0–53.8) 98.4 (97.0–99.3)
   Not transfused 143 117 43.4 (35.1–51.9) 99.8 (99.8–99.9) 53.0 (43.5–62.3) 99.8 (99.7–99.8)
APH Overall   798 874 56.3 (52.7–59.7) 98.8 (98.7–98.9) 51.4 (48.0–54.7) 99.0 (98.9–99.1)
  Transfusion status Transfused 46 30 34.8 (21.4–50.2) 97.4 (95.6–98.5) 53.3 (34.3–71.7) 94.5 (92.2–96.3)
   Not transfused 752 844 57.6 (54.0–61.1) 98.8 (98.7–98.9) 51.3 (47.9–54.7) 99.1 (99.0–99.2)
Thalassaemia Overall   751 23 2.5 (1.5–3.9) 100.0 (100.0–100.0) 82.6 (61.2–95.0) 98.0 (97.8–98.1)
  Transfusion status Transfused 25 3 12.0 (2.5–31.2) 100.0 (99.3–100.0) 100.0 (29.2, 100.0) 96.2 (94.2–97.6)
   Not transfused 726 20 2.2 (1.3–3.6) 100.0 (100. 100.0) 80.0 (56.3–94.3) 98.0 (97.8–98.1)
  1. GP general practitioner
  2. aIncluding shared GP