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Table 1 Characteristics of studies included in meta-analyses*

From: Female smokers beyond the perimenopausal period are at increased risk of chronic obstructive pulmonary disease: a systematic review and meta-analysis

Source Project name Sample size Women (%) Average age at baseline (year) Duration of follow up (year)
Viegi et al,22 2001 Po River Delta Epidemiologic Study, North Italy 1774 51 32 8
Chinn et al,12 2005 European Community Respiratory Health Survey II, 27 centers, 26 were in western Europe and one was in the USA 6654 51 34 9
Rijcken et al,13 1995 Vlagtwedde-Vlaardingen study in the Netherlands 1619 43 39 25
Jedrychowski et al,14 1986 Cracow Study in Cracow, Poland 1364 64 40 13
James et al,15 2005 Busselton Health Study in Busselton, Western Australia 9317 51 42 29
Tashkin et al,16 1984 UCLA Population Studies in Los Angeles County, USA 2401 54 46 5
Sherrill et al,17 1996 Tucson Epidemiology Study of Obstructive Lung Disease in Tucson, Arizona, USA 477 41 48 8
Connett et al,23 2003 Lung Health Study, 10 centres, nine in the USA, one in Canada 5346 37 48 5
Xu et al,18 1992 Six Cities Study in the USA 12 080 55 49 6
Vestbo et al,19 1996 Copenhagen City Heart Study, Denmark 9435 57 53 5
Griffith et al,20 2001 Cardiovascular Health Study in the USA 5242 57 73 7
  1. Symbols: *: Order in table: average age at baseline; †: The participants were smokers with mild-to-moderate COPD.