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Table 3 Description of the probabilistic linkage blocking passes

From: Record linkage under suboptimal conditions for data-intensive evaluation of primary care in Rio de Janeiro, Brazil

Blocking pass Indexing key Comparison Calculated score range according to estimated weights Score cutoff values
CadU × HR CadU × IH CadU × IM
1 Soundex first name + Soundex last name + sex + birthyear Individual name + mother’s name + birth date − 38.71 to 34.99 28.60 33.97 21.90
2 Soundex first name + sex + birthyear Individual name + mother’s name + birth date − 38.71 to 34.99 31.67 32.88 31.91
3 Soundex last name + sex + birthyear Individual name + mother’s name + birth date − 38.71 to 34.99 34.00 34.55 34.11
4 Soundex first name + soundex last name + sex Individual name + mother’s name + birth date − 38.71 to 34.99 32.73 33.00 31.70
5 Soundex first name + soundex last name + birthyear Individual name + mother’s name + birth date − 38.71 to 34.99 32.21 33.12 34.44
6 Soundex first name + soundex last name + sex + birthyear First individual name + last individual name + mother’s name + birth date − 53.51 to 45.38 41.30 43.86 44.23
7 Soundex first name + soundex last name + sex + birthyear Individual name + birth date − 32.57 to 21.9 17.20 17.68 17.32
  1. Social Benefits National Registry (Cadastro Único—CadU); Family Health Registry (Sistema de Cadastro da Estratégia de Saúde da Família—FHR); National Hospital Admission System (Sistema de Informações Hospitalares—SIH); National Mortality Information System (Sistema de Informações sobre Mortalidade—SIM)