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Table 1 Criteria used to find records for HIV-positive women reported to NSHPC and UK CHIC

From: Using two on-going HIV studies to obtain clinical data from before, during and after pregnancy for HIV-positive women

Criteria used to find records (All pairs of records have the same DOB) Records matched (n = 2063)
   N % Cumulative%
Exact CD4 date CD4 ± 10 cells/mm3 1492 72.3 72.3
  HIV diagnosis date/site 39 1.9 74.2
CD4 date ±30 days CD4 ± 10 cells/mm3 251 12.2 86.4
  HIV diagnosis date/site 59 2.9 89.2
ART drug start and stop dates Exact dates 64 3.1 92.3
  Dates ±7 days 48 2.3 94.7
Manual Site match 58 2.8 97.5
  Diagnosis date ±30 days 4 0.2 97.7
Drug start or stop dates 2 0.1 97.8
Soundex 7 0.3 98.1
ART profile 39 1.9 100.0