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Table 1 Accuracy of reporting in the NSW Inpatient Statistics Collection, New South Wales, Australia, 1994–1996

From: Using hospital discharge data for determining neonatal morbidity and mortality: a validation study

Description NICUS data N APDC data N Both data sets* N Sn % (95% CI) Sp % (95% CI) NPV % (95% CI) PPV % (95% CI)
Diagnoses        
Death in birth admission 289 261 260 90.0 (85.9–93.2) 100 (99.7–100) 98.7 (98.1–99.1) 99.6 (97.9–100)
Very low birthweight 400–1499 g 1,242 1,216 1213 97.7 (96.7–98.4) 99.7 (99.2–99.9) 97.6 (96.5–98.4) 99.8 (99.3–99.9)
Intra-ventricular hemorrhage 394 238 205 52.0 (47.0–57.1) 98.4 (97.7–98.9) 91.4 (90.1–92.5) 86.1 (81.1–90.3)
Any brain hemorrhage‡ 400 281 251 62.8 (57.8–67.5) 98.4 (97.7–98.9) 92.4 (91.1–93.5) 89.3 (85.1–92.7)
Retinopathy of prematurity 273 169 157 57.5 (51.4–63.4) 99.4 (99.0–99.7) 94.9 (93.9–95.7) 92.9 (87.9–96.3)
Respiratory distress syndrome‡ 1205 1022 991 82.2 (80.0–84.4) 92.4 (89.4–94.8) 63.9 (59.8–67.7) 97.0 (95.7–97.9)
Transient tachypnea‡ 347 206 146 42.1 (36.8–47.5) 85.3 (81.5–88.6) 63.5 (59.3–67.5) 70.9 (64.2–77.0)
Meconium aspiration‡ 56 40 38 67.9 (54.0–79.7) 99.5 (98.2–99.9) 95.8 (93.4–97.5) 95.0 (83.1–99.4)
Pneumonia‡ 29 15 14 48.3 (29.4–67.5) 99.8 (98.6–100) 96.5 (94.2–98.0) 93.3 (68.1–99.8)
Pulmonary hypertension‡ 53 34 34 64.2 (49.8–79.9) 100 (99.1–100) 95.6 (93.2–97.3) 100 (89.7–100)
Necrotizing enterocolitis 76 55 47 61.8 (50.0–72.8) 99.7 (99.3–99.9) 98.8 (98.3–99.2) 85.5 (73.3–93.5)
Selected major anomalies† 41 42 39 95.1 (83.5–99.4) 99.9 (99.6–100) 99.9 (99.7–100) 92.9 (80.5–98.5)
Procedures        
Any mechanical ventilation (including CPAP) 2,023 1,552 1540 76.1 (74.2–78.0) 97.1 (94.9–98.5) 45.1 (41.8–48.5) 99.2 (98.7–99.6)
Cont. positive airways pressure 1055 785 691 65.5 (62.5–68.4) 93.2 (91.7–94.4) 77.9 (75.8–79.9) 88.0 (85.5–90.2)
Drainage of air leak 135 60 50 37.0 (28.9–45.8) 99.6 (99.2–99.8) 96.4 (95.6–97.1) 83.3 (71.5–91.7)
Patent ductus arteriosus surgery 19 18 18 94.7 (74.0–99.9) 100 (99.8–100) 100 (99.8–100) 100 (81.5–100)
Necrotizing enterocolitis surgery 17 14 14 82.4 (56.6–96.2) 100 (99.8–100) 99.9 (99.6–100) 100 (76.8–100)
Major surgery 77 74 70 90.9 (82.2–96.3) 99.8 (99.6–100) 99.7 (99.4–99.9) 94.6 (86.7–98.5)
  1. Sn = Sensitivity, Sp = Specificity;* N = 2,432;
  2. †Selected major anomalies included diaphragm anomalies, abdominal wall anomalies, spina bifida, tracheo-esophageal fistula and tetralogy of fallot. ‡ These diagnoses may be under-recorded in the NICUS data since only a primary diagnosis could be recorded (see Table 2)