Journal of Cancer Epidemiology / 2014 / Article / Tab 1 / Review Article
Smokeless Tobacco and Oral Cancer in South Asia: A Systematic Review with Meta-Analysis Table 1 Characteristics of included studies on oral cancer.
Authors Year Location Study type Sample Size (cases/controls) (Cohort size/oral cancer cases)** Quality assessment* Mean age of cases Adjustment for smoking and alcohol Sankaranarayanan et al. [29 ] 1989 India Case-control 228/453 Moderate n/a Smoking and alcohol Sankaranarayanan et al. [30 ] 1989 India Case-control 187/895 Moderate n/a Smoking and alcohol Goud et al. [32 ] 1990 India Case-control 102/102 Weak 53 No Nandakumar et al. [33 ] 1990 India Case-control 348/348 Moderate 54.8 No Sankaranarayanan et al. [31 ] 1990 India Case-control 414/895 Moderate n/a Smoking and alcohol Rao et al. [34 ] 1994 India Case-control 713/635 Moderate 50.35 Smoking and alcohol Khan et al. [35 ] 1995 Pakistan Case-control 24/24 Moderate 54 No Wasnik et al. [36 ] 1998 India Case-control 123/246 Moderate n/a No
Dikshit and Kanhere [37 ] 2000 India Case-control 558/260 Moderate n/a Smoking Merchant et al. [38 ] 2000 Pakistan Case-control 79/149 Moderate 49 Smoking and alcohol Balaram et al. [39 ] 2002 India Case-control 591/582 Moderate n/a No
Znaor et al. [40 ] 2003 India Case-control 1563/3638 Moderate n/a Smoking and alcohol Subapriya et al. [41 ] 2007 India Case-control 388/388 Moderate 50.85 No Gangane et al. [42 ] 2007 India Case-control 140/380 Weak n/a No Basu et al. [43 ] 2008 India Case-control 110/110 Weak n/a No Muwonge et al. [44 ] 2008 India Case-control 282/1410 Moderate n/a Smoking and alcohol Jayalekshmi et al. [45 ] 2009 India Cohort study 79593/92** Moderate n/a No Jayalekshmi et al. [46 ]
2011 India Cohort study 66277/160** Moderate n/a No Pednekar et al. [47 ] 2011 India Cohort study 87222/1267** Moderate n/a No Madani et al. [48 ] 2012 India Case-control 350/350 Moderate n/a Smoking and alcohol Ray et al. [49 ] 2013 India Case-control 698/948 Weak n/a No
*Based on the “Effective Public Health Project Quality Assessment Tool for Quantitative Studies”.
**Size of the cohort and the number of oral cancer cases in the cohort.