BioMed Research International / 2017 / Article / Tab 1

Review Article

Long-Term Sleep Duration as a Risk Factor for Breast Cancer: Evidence from a Systematic Review and Dose-Response Meta-Analysis

Table 1

Characteristics of studies and participants included in meta-analysis.

AuthorYearCountryStudyNumber of participantsFollow-up/investigated yearsAge at baselinePostmenopausal (%)Study design

Xiao et al. [9]2016AmericaSouthern community cohort study429532002–200952.1866.70%Cohort study

Hurley et al. [10]2015AmericaCalifornia teachers study101609“1995-1996” to 201152.0058.28%Cohort study

Wang et al. [11]2014ChinaGuangzhou breast cancer study14542010–201247.5037.14%Case-control study

Vogtmann et al. [12]2013AmericaWomen’s health initiative1100111992–200762.91100%Cohort study

Wu et al. [13]2012SingaporeSingapore Chinese health study34028“1993–1998” to 201045–7492.73%Nested case-control study

Girschik et al. [14]2012AustraliaBreast cancer environment and employment study28282009–201118–8088.79%Case-control study

Kakizaki et al. [15]2008JapanOhsaki national health insurance cohort study239951994 to “1995–2003”60.7665.42%Cohort study

Pinheiro et al. [16]2006AmericaNurses’ health study77418“1986, 2000” to “1986, 2002”52.9456.87%Cohort study

McElroy et al. [17]2005AmericaUS case-control study93471997–199920–6954.98%Case-control study

Verkasalo et al. [18]2005FinlandFinnish twin cohort12222“1975, 1981” to “1976–1996”36.50Cohort study

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