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Table 1 Reliability of reporting of bleeding-related conditions in coded hospital data across two tertiary hospitals, New South Wales, 2011–2015, compared to obstetric data (ObstetriX) as the reference standard

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

  ObstetriX (%) Coded hospital data (%) Both Sensitivity
(95% CI)
Specificity
(95% CI)
PPV
(95% CI)
NPV
(95% CI)
Anaemia (nutritional or haemolytic) 1530 (4.2) 1425 (4.0) 206 13.5 (11.8–15.3) 96.5 (96.3–96.7) 14.5 (12.7–16.4) 96.2 (96.0–96.4)
Nutritional anaemias 1412 (3.9) 308 (0.9) 99 7.0 (5.7– 8.5) 99.4 (99.3–99.5) 32.1 (27.0–37.7) 96.3 (96.1–96.5)
Haemolytic anaemias 140 (0.4) 64 (0.2) 23 16.4 (10.7–23.6) 99.9 (99.8–99.9) 35.9 (24.3–48.9) 99.7 (99.6–99.7)
Iron deficiency anaemia 1341 (3.7) 1415 (3.9) 170 12.7 (10.9–14.6) 96.4 (96.2–96.6) 12.0 (10.4–13.8) 96.6 (96.4–96.8)
Anaemia (Hb < 110 g/L) in pregnancy 6819 (19.4) 1400 (3.9) 534 7.8 (7.2–8.5) 96.9 (96.7–97.1) 38.1 (35.6–40.8) 81.4 (81.0–81.8)
B12 deficiency anaemia 113 (0.3) 14 (0.0) 5 4.4 (1.5–10.0) 100.0 (100.0–100.0) 35.7 (12.8–64.9) 99.7 (99.6–99.8)
Any bleeding before birtha 985 (2.7) 1128 (3.1) 641 65.1 (62.0– 68.1) 98.6 (98.5– 98.7) 56.8 (53.9–59.7) 99.0 (98.9–99.1)
Antepartum haemorrhage 798 (2.2) 874 (2.4) 449 56.3 (52.7–59.7) 98.8 (98.7–98.9) 51.4 (48.0–54.7) 99.0 (98.9–99.1)
Intrapartum haemorrhage 155 (0.4) 130 (0.4) 65 41.9 (34.1–50.1) 99.8 (99.8–99.9) 50.0 (41.1–58.9) 99.8 (99.7–99.8)
Postpartum haemorrhage (PPH) 4330 (12.0) 4001 (11.1) 3585 82.8 (81.6–83.9) 98.7 (98.6–98.8) 89.6 (88.6–90.5) 97.7 (97.5–97.8)
PPH following caesarean section 1158 (10.7) 902 (8.3) 741 64.0 (61.2–66.7) 98.3 (98.1–98.6) 82.2 (79.5–84.6) 95.8 (95.4–96.2)
PPH following vaginal birth 3170 (12.6) 3097 (11.4) 2842 89.7 (88.5–90.7) 98.8 (98.7–99.0) 91.8 (90.7–92.7) 98.5 (98.4–98.7)
Red blood cell transfusion 575 (1.6) 681 (1.9) 531 92.4 (89.9–94.4) 99.6 (99.5–99.6) 78.0 (74.7–81.0) 99.9 (99.8–99.9)
Placental abruption 126 (0.3) 150 (0.4) 86 68.3 (59.4–76.3) 99.8 (99.8–99.9) 57.3 (49.0–65.4) 99.9 (99.9–99.9)
Placenta praevia 337 (0.9) 379 (1.1) 274 81.3 (76.7–85.3) 99.7 (99.6–99.8) 72.3 (67.5–76.7) 99.8 (99.8–99.9)
Placenta accreta 22 (0.1) 74 (0.2) 15 68.2 (45.1–86.1) 99.8 (99.8–99.9) 20.3 (11.8–31.2) 100.0 (100.0–100.0)
Thalassaemia 751 (2.1) 23 (0.1) 19 2.5 (1.5–3.9) 99.9 (99.9–100.0) 82.6 (61.2–95.1) 98.0 (97.8–98.1)
Platelet disorders 137 (0.4) 222 (0.6) 34 24.8 (17.8–32.9) 99.5 (99.4–99.55) 15.3 (10.9–20.7) 99.7 (99.7–99.8)
Coagulation disorders 191 (0.5) 87 (0.2) 22 11.5 (7.4–16.9) 99.8 (99.8–99.86) 25.3 (16.6–35.8) 99.5 (99.5–99.6)
Hysterectomy 25 (0.1) 29 (0.1) 24 96.0 (79.7–99.9) 99.9 (99.9–100.0) 82.8 (64.2–94.2) 100.0 (100.0–100.0)
  1. Hb haemoglobin, derived from pathology in obstetrics data
  2. aAntepartum haemorrhage, intrapartum haemorrhage, or placental abruption