Effect of tobacco control policies on the Swedish smoking quitline using intervention time-series analysis.

Results Pictorial warnings and referral to quitline in May 2016 A visual inspection of the observed calling rates per 100 000 smokers ( figure 1 ) suggests a decreasing trend in the 4 years preceding the intervention with a strong seasonal variation consisting in higher values around the end/begin (October–January) of the year and lower values in the summer time (July).

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