Methods Data We used pooled files from the Integrated Public Use Microdata Series (IPUMS) for NHIS surveys with information on ST use and smoking (1987, 1991, 1992, 1994, 1998, 2000, 2005, and 2010) and linked to the National Death Index [6] to obtain follow-up from year of interview to year of death or December 31, 2015, the censor date for participants who did not die
As a systematic review by the Cochrane Library noted: "The small number of trials, low event rates and wide confidence intervals around the estimates mean that our confidence in the result is rated 'low.'" For example, there were weaknesses in the randomized trials
Don't be discouraged if your first few attempts aren't perfect
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