title: Unpredictable bias when using the missing indicator method or complete case analysis for missing confounder values: an empirical example.
authors.affiliation: Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Str. 6.131, PO Box 85500, 3508 GA Utrecht, The Netherlands. m.j.knol@umcutrecht.nl
authors.forename: Mirjam J
authors.initials: MJ
authors.lastname: Knol
authors.forename: Kristel J M
authors.initials: KJ
authors.lastname: Janssen
authors.forename: A Rogier T
authors.initials: AR
authors.lastname: Donders
authors.forename: Antoine C G
authors.initials: AC
authors.lastname: Egberts
authors.forename: E Rob
authors.initials: ER
authors.lastname: Heerdink
authors.forename: Diederick E
authors.initials: DE
authors.lastname: Grobbee
authors.forename: Karel G M
authors.initials: KG
authors.lastname: Moons
authors.forename: Mirjam I
authors.initials: MI
authors.lastname: Geerlings