Table 1:
Characteristics of published studies on tea consumption and lung cancer risk
| Study | Study period | Country | Study design | Case-control or cohort | Tea type | OR (95%CI) | NOS score (stars) |
|---|---|---|---|---|---|---|---|
| Romain 2016(14) | 1996–2001 | Canada | PCC | 1111/1469 | Black | 0. 71[0. 61, 0. 83] | 8 |
| Wu 2015(15) | 2001–2010 | China | PCC | 117/1196 | Green | 0. 87[0. 70, 1. 07] | 7 |
| Wang 2015(16) | 2012–2014 | China | HCC | 88/84 | Tea | 0. 97[0. 53, 1. 76] | 7 |
| Mai 2015(17) | 1992–2011 | US | Cohort | 1137/94887 | Tea | 0. 83[0. 71, 0. 96] | 8 |
| Katarzyna 2015(18) | 2014 | Poland | PCC | 92/156 | Green | 0. 49[0. 26, 0. 93] | 7 |
| Bao 2014(18) | 2010–2013 | China | HCC | 50/50 | Green | 0. 22[0. 08, 0. 60] | 7 |
| Rup 2014(20) | 2009–2012 | India | PCC | 230/460 | Tea | 0. 95[0. 61, 1. 49] | 7 |
| P. gnagna 2013(22) | 2004–2005 | Italy | Cohort | 178/4158 | Tea | 0. 72[0. 52, 0. 99] | 8 |
| Xu 2013(21) | 2006–2012 | China | HCC | 1225/1234 | Tea | 0. 98[0. 84, 1. 15] | 7 |
| Yumie 2013(23) | 2002–2009 | China | Cohort | 359/60733 | Tea | 0. 66[0. 53, 0. 83] | 7 |
| Jin 2013(24) | 2003–2010 | China | PCC | 1424/4543 | Green | 1. 05[0. 92, 1. 20] | 8 |
| Yumiel 2013(25) | 2001–2011 | China | Cohort | 428/70839 | Tea | 1. 00[0. 81, 1. 23] | 7 |
| Lin 2012(26) | 2004–2008 | China | HCC | 170/340 | Green | 0. 34[0. 21, 0. 55] | 7 |
| Zhang 2012(27) | 1997–2009 | China | PCC | 900/133811 | Tea | 1. 16[1. 01, 1. 32] | 8 |
| Bganesh 2011(28) | 1997–1999 | India | HCC | 408/1383 | Tea | 0. 24[0. 11, 0. 55] | 6 |
| Jiang 2011(29) | 2009–2011 | China | HCC | 100/100 | Tea | 0. 92[0. 53, 1. 61] | 7 |
| Lu 2009(30) | 1992–1995 | US | Cohort | 201/38207 | Tea | 0. 81[0. 61, 1. 08] | 7 |
| Han 2008(31) | 2003–2008 | China | HCC | 523/1924 | Green | 0. 56[0. 44, 0. 73] | 7 |
| Zhang 2008(32) | 2002–2006 | China | PCC | 505/529 | Tea | 1. 16[0. 89, 1. 53] | 8 |
| Wang 2008(24) | 2006 | China | HCC | 363/363 | Tea | 0. 60[0. 44, 0. 82] | 7 |
| Qli 2008(33) | 1994–2001 | Japan | cohort | 302/41138 | Green | 1. 29[0. 98, 1. 69] | 8 |
| Yan 2008(35) | 1999–2004 | US | PCC | 558/837 | Green&Black | 0. 52[0. 42, 0. 66] | 7 |
| Tao 2007(36) | 2002–2006 | China | HCC | 47/94 | Tea | 0. 72[0. 31, 1. 70] | 6 |
| Shinchi 2006(4) | 1995–2005 | Japan | Cohort | 222/16247 | Green | 1. 13[0. 82, 1. 56] | 8 |
| Hu 2002(39) | 1994–1997 | Canada | PCC | 161/483 | Tea | 0. 52[0. 34, 0. 81] | 8 |
| Mattew 2005(37) | 1995–1996 | China | PCC | 122/121 | Green | 0. 83[0. 44, 1. 54] | 7 |
| Ja 2005(38) | 1982–1998 | US | PCC | 993/986 | Black | 0. 95[0. 79, 1. 13] | 6 |
| Nagano 2001(41) | 1979–1994 | Japan | Cohort | 395/35930 | Green | 0. 86[0. 66, 1. 12] | 9 |
| Zhong 2001(40) | 1992–1994 | China | PCC | 649/675 | Green | 0. 97[0. 74, 1. 26] | 7 |
| Hivonen 2001(42) | 1995–1998 | Finland | PCC | 791/25643 | Tea | 0. 66[0. 53, 0. 81] | 7 |
| Kei 2000(3) | 1986–1997 | Japan | Cohort | 69/9483 | Green | 1. 01[0. 62, 1. 63] | 6 |
| Ki 1997(45) | 1992–1993 | China | HCC | 105/105 | Tea | 0. 50[0. 23, 1. 10] | 7 |
| Fredrik 1998(43) | 1989–1995 | Sweden | PCC | 124/235 | Black | 1. 23[0. 78, 1. 96] | 8 |
| Maria 1998(44) | 1994–1996 | Uruguay | HCC | 427/428 | Black | 0. 78[0. 60, 1. 02] | 7 |
| Alexandra 1996(46) | 1986–1990 | Netherlands | Cohort | 764/120088 | Black | 0. 58[0. 49, 0. 70] | 8 |
| Zheng 1996(47) | 1986–1993 | US | Cohort | 312/35057 | Black | 0. 78[0. 62, 0. 99] | 7 |
| Gosta 1996(48) | 1989–1993 | Sweden | PCC | 308/504 | Black | 0. 71[0. 53, 0. 94] | 7 |
| Xu 1996(49) | 1987–1993 | China | PCC | 598/926 | Tea | 0. 84[0. 68, 1. 03] | 9 |
| Ohno 1995(50) | 1988–1991 | Japan | PCC | 333/666 | Tea | 0. 57[0. 39, 0. 83] | 9 |
| Tewes 1990(51) | 1981–1983 | China | PCC | 200/200 | Green&Black | 0. 98[0. 66, 1. 45] | 6 |
| Mettlin 1989(52) | 1982–1987 | US | HCC | 569/569 | Tea | 0. 71[0. 56, 0. 91] | 6 |
| Kinlen 1988(53) | 1969–1986 | UK | Cohort | 718/12868 | Tea | 1. 67[1. 31, 2. 13] | 7 |
PCC, population-based case-control study; HCC, hospital-based case-control study; US, United States; UK, United Kingdom