Table 1.

Summary of individual studies with information on involuntary smoking in International Head and Neck Cancer Epidemiology consortium pooled data version 1.1

Reference*Study locationRecruitment periodCases
Controls
SourceParticipation rate (%)NoNever tobacco usersSourceParticipation rate (%)NoNever tobacco users
14Central Europe (Banská Bystrica, Bucharest, Budapest, Lodz, and Moscow)1998-2003Hospital9676249Hospital, unhealthy97907308
15Puerto Rico1992-1995Cancer registry7135032Residential records83521211
NALatin America (Buenos Aires, Havana, Goiânia, Pelotas, Porto Alegre, Rio de Janeiro, and São Paulo)2000-2003Hospital952,191123Hospital, unhealthy861,706506
16Tampa, FL1994-2003Hospital9820737Cancer screening clinic, healthy90897345
17Los Angeles, CA1999-2004Cancer registry49417115Neighborhood67.51,005453
18Houston, TX2001-2006Hospital95829186Hospital visitors>80865374
Total4,7565425,9012,197
  • * Representative publication in which study methods are available.

  • All studies frequency matched controls to cases, minimally on age and sex. Additional frequency matching factors included center (Central Europe and Latin America studies), ethnicity (Tampa study), and neighborhood (Los Angeles study).

  • Multicenter study.