Table 1 Characteristics of studies on tea consumption and prostate cancer risk
From: Tea consumption and prostate cancer: an updated meta-analysis
Author, year | Design | Population, region | Tea type | Lowest consumption level | Highest consumption level | OR/RR (95% CI) for the highest vs. lowest level |
|---|---|---|---|---|---|---|
Severson, 1989 [18] | Cohort | Japanese, USA | Green | None | Ever | 1.47 (0.99-2.19) |
Cohort | Japanese, USA | Black | None | Ever | 0.83 (0.61-1.13) | |
Vecchia, 1992 [19] | HCC | Italian, Italy | NS | None | > = 1 cup/day | 0.9 (0.5-1.7) |
Slattery, 1993 [20] | PCC | American, USA | NS | None | >5 cups/week | 1.06 (0.72-1.57) |
PCC | American, USA | NS | None | >5 cups/week | 0.90 (0.59-1.36) | |
Jain, 1998 [35] | PCC | Candian, Canada | NS | None | >500 g/day | 0.70 (0.50-0.99) |
Villenecuve, 1999 [21] | PCC | Canadian, Canada | NS | None | > = 4 cups/day | 1.1 (0.8-1.5) |
Ellison, 2000 [22] | Cohort | Canadian, Canada | Black | None | >750 ml/day | 1.03 (0.58-1.82) |
Sharpe, 2002 [33] | PCC | Canadian, Canada | Black | <54 drink-years | >107 drink-years | 2.0 (1.3-3.0) |
Sonoda, 2004 [34] | HCC | Japanese, Japan | Green | <=1 cup/day | > = 10 cups/day | 0.67 (0.27-1.64) |
HCC | Japanese, Japan | Black | none | > = 1 cup/day | 1.51 (0.89-2.56) | |
Allen, 2004 [23] | Cohort | Japanese, Japan | Green | <1 time/week | > = 5 times/week | 1.29 (0.84-1.98) |
Cohort | Japanese, Japan | Black | <2 times/week | amost daily | 0.86 (0.47-1.59) | |
Jian, 2004 [24] | HCC | Chinese, China | Green | None | > = 5 g/day | 0.10 (0.04-0.23) |
Kikuchi, 2006 [25] | Cohort | Japanese, Japan | Green | <1 cup/day | > = 5 cups/day | 0.85 (0.5-1.43) |
Kurahashi, 2008 [26] | Cohort | Japanese, Japan | Green | <1 cup/day | > = 5 cups/day | 0.90 (0.66-1.23) |
Wu, 2009 [27] | HCC | Chinese, China | Green | None | Ever | 0.52 (0.28-0.96) |
HCC | Chinese, China | Black | None | Ever | 0.55 (0.23-1.31) | |
HCC | Chinese, China | Oolong | None | Ever | 0.73 (0.39-1.37) | |
Tyagi, 2010 [32] | PCC | Indian, India | NS | None | Ever | 0.45 (0.21-0.97) |
Ganesh, 2011 [31] | HCC | Indian, India | NS | None | Ever | 0.7 (0.1-3.4) |
Stefani, 2011 [30] | HCC | Uruguayan, Uruguay | Black | None | > = 7 cups/week | 0.43 (0.22-0.81) |
Berroukche, 2012 [10] | HCC | Algerian, Algeria | Green | <=1 cups/day | > cups/day | 0.6 (0.3-1.1) |
Montague, 2012 [11] | PCC | Chinese, Singapore | Green | None | > = 2 cups/day | 0.95 (0.62-1.45) |
PCC | Chinese, Singapore | Black | None | > = 2 cups/day | 1.17 (0.67-2.07) | |
Shafique, 2012 [12] | Cohort | Scottish, Scotland | Black | 0-3 cups/day | > = 7 cups/day | 1.50 (1.06-2.12) |
Geybels, 2013 [29] | Cohort | Dutch, Netherland | Black | <=1 cup/day | > = 5 cups/day | 0.97 (0.8-1.17) |
Geybels, 2013 [28] | PCC | American, USA | Black | <=1 cups/week | > = 2 cups/day | 0.63 (0.45-0.9) |