Bibcode:2006GeoRL..3313308L
For example, a persons chances of getting basal cell skin cancer increases with the cumulative exposure to ultraviolet rays from the sun over a lifetime
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Independent variables were tobacco tax year (using the 2002 tobacco tax year as reference and testing for linear trends, and also conducting reverse adjacent contrasts to examine whether or not each successive survey period resulted in a change in affordability that was statistically significant from the last), sex, age and age squared (to test for non-linear associations with age), ethnicity, region, education, TTFC and purchase source (UK store-based or non-UK/non-store-based sources)
Only 11 HPHCs (9%) were quantifiable in all pipe tobacco brands tested, while 33 HPHCs (28%) werent quantifiable in any brands