From: Associations between aspirin use and the risk of cancers: a meta-analysis of observational studies
Study source | Sex | Study period | Source of subjects | No of case | No of control/cohort size | Cancer site | Exposure assessment | Exposure Definition | Adjustment for covariates | Study quality |
---|---|---|---|---|---|---|---|---|---|---|
Cohort studies | ||||||||||
 Patel D [234], 2015, US | M/F | 1993–2001 | AARP | 292 | 269,553 | Thyroid cancer | Questionnaires | Use aspirin ≤ 2 times/Week(no regular use) | 2,3,6,8,11 | 7 |
 |  |  | PLCO | 56 | 58,433 | Thyroid cancer | Questionnaires | Use aspirin ≤ 2 times/Week(no regular use) | 2,3,6,8,11 | 6 |
 |  |  | U.S. Radiologic Technologists Study | 133 | 60,591 | Thyroid cancer | Questionnaires | Use aspirin ≤ 2 times/Week(no regular use) | 2,3,6,8,11 | 6 |
 Brasky TM [92], 2014, US | F | 1998–2010 | WHI | 229 | 142,330 | Thyroid cancer | Questionnaires | Use at both baseline and year 3 visits (consistent) | 1,3,4,5,6,7,9,10,11,12,13,14,15,16,17,18,19,22,24,25,26,27,28,29,30,31,32,33,34,35,36,37 | 9 |