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2013 (when they constitute about 15 with the population) than they had in 2013 (after they constitute about 15 of the population) than they had in 1999 (when everyday smoking prevalence was about 30 ). Though this consistency might have some thing to do with what in an international context may be characterised as Norwegian affluence, in addition, it indicates that the expanding "marginalisation of smokers" amongst the public (that is what we've studied here, and which we only obtain minor support for) is a distinctive sort of question than the overrepresentation of smokers in marginal problem groups (which we have not studied right here). The hardening hypothesis has also been questioned, in addition to a recent study of title= brb3.242 32 nations (US and EU) suggests that the remaining smoker population is in truth softening, not hardening [59].Limitations Response rateThe low response rate with the current study raises issues about the representativeness in the sample, andS ?and Kvaavik BMC Public Health (2016) 16:Page 11 ofthe validity of your outcomes. The wide range of societal difficulties covered within the survey, of which some may possibly seem title= journal.pcbi.1005422 complex to citizens who usually do not follow politics closely, as well because the sheer magnitude on the questionnaire, could indicate a reduce response price among lesser privileged groupings in society. In the event the relative size of lesser privileged groups increases a lot more amongst smokers than non-smokers more than time, and these subjects do not respond to surveys to a higher extent, the non-response in distinct smoking groups may well alter differently over time and introduce a greater non-response bias in 2013 than in previous years, such a bias have to be considered when interpreting the findings. On the other hand, the trends found in each day smoking in this study resemble those discovered in other studies with larger response rates, so the analytical sample inside the present study would appear to be reasonably unbiased. Also, comparisons on the sample applied here with other data sets with regard to other indicators than smoking status (for example housing and BMI), recommend that the sample is largely representative in terms of public well being indicators [30, 47, 48]. Even if the sample, like any household survey, is probably to underestimate the size in the most marginalised smokers (homeless people today, drug addicts, people in prisons), it really is less most likely that this underestimation threatens the validity of the study.Weighted datausing un-weighted data (about two percentage points for all years combined), otherwise the results had been comparable employing the two diverse solutions. The similarities in the benefits from weighted and un-weighted information inside the current study indicate that our findings are valid.Self-reportingAll elements employed inside the existing analyses were obtained by self-reporting, which is vulnerable to recall bias and social desirability [63?5]. Desirable positions and healthpromoting behaviour might be overestimated when unwanted positions/situations and unhealthy behaviours could be underestimated. The prospective for over and underestimation may differ inside the distinct smoking groups, and a single ought to keep in mind the possibility of incorrect estimates of associations.Weighting information to boost the representativeness from the study sample could cause some issues.

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