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Table 3 Laboratory data and PDA diagnosis compared

From: Quality of EHR data extractions for studies of preterm birth in a tertiary care center: guidelines for obtaining reliable data

  1. Manually abstracted database, # of subjects 2. EHR extract-ion, # of subjects 3. Discrepancy (% and # of subjects) between the databases a 4. Manually abstracted database errors 5. EHR-extracted data errors 6. Median discrepancy 7. Discrepancy range
1st WBC count b 1257 1437 3.2 % (40) 2.5 %(32) 0.6 % (8) c*** 0.75 k/mm3 0.01–109 k/mm3
1st Hemoglobin 1333 1460 11.9 % (158) 5.8 % (77) 8.3 % (110) d * 1.4 g/dl 0.1–25.9 g/dl
Peak total bilirubin 1565 1336 11.4 % (152) 6.9 % (92) 5.1 % (68) e * 1.45 mg/dl 0.1–15.2 mg/dl
Peak direct bilirubin 681 674 4.9 % (33) 4.5 % (30) 0.9 % (6) f **** 0.5 mg/dl 0.1–16.4 mg/dl
PDA 512 414 12.8 % (53) 12.8 %(53) 8.2 % (34) g *** NA NA
  1. Laboratory data and PDA parameters compared in the paper. The denominator for the percentage is the smaller of the corresponding values in the first two columns
  2. *P0.05; **P0.01; ***P0.001; ****P0.0001
  3. a - In general, the sum of the error counts in columns 4 and 5 do not add up to the number in column 3, because the error occurred in both manually and electronically extracted data, or the cause was ambiguous
  4. b - Re-calculated discrepancies after adjusting for the inappropriate Hispanic category in the race column
  5. c - Difference statistically significant, p = 1.3 × 10−4 by Chi-square test
  6. d - Difference statistically significant, p = 0.012 by Chi-square test
  7. e - Difference statistically significant, p = 0.05 by Chi-square test
  8. f - Difference statistically significant, p = 4.9 × 10−5 by Chi-square test
  9. g - Difference statistically significant, p = 0.001 by Chi-square test