Matching in case control studies - The INCLEN Trust

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Matching: Definition • Creation of a link between cases and controls • This link is: • Based upon common characteristics • Created when the study is designed • Kept through the analysis The concept of matching
Types of matching strategies • Frequency matching • Large strata • Set matching • Small strata • Sometimes very small (1/1: pairs) The concept of matching
Page 1 and 2: Arranged marriage Matching in case
Page 3 and 4: Key elements • The concept of mat
Page 5 and 6: Matching: concept • Confounding i
Page 7: Consequences.... • The problem:
Page 11 and 12: Matching: True statements Matching
Page 13 and 14: Example: Risk factors for microspor
Page 15 and 16: Matched analysis by set (Pairs of 1
Page 17 and 18: The Mantel-Haenszel odds ratio... O
Page 19 and 20: …and the analysis can be done wit
Page 21 and 22: The old 2 x 2 table... Cases Contro
Page 23 and 24: The Mac Nemar chi-square Chi 2 McN=
Page 25 and 26: Matching: Inconvenience • Must be
Page 27 and 28: Hidden matching (“Crypto-matching
Page 29 and 30: Breaking the match • Rationale

Matching in case control studies - The INCLEN Trust

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