In 2011, the BRFSS weighting methodology was changed. This makes data collected from 2011 forward incomparable to data collected prior to 2011. The SHIP resumed including BRFSS data in 2013, where baselines from 2011 BRFSS data were calculated.
Data collected from survey respondents are adjusted to more accurately represent the Maryland population. This is called ""weighted data."" Learn more about weighted data here: http://www.marylandbrfss.org/pdf/BRFSS-Special-Report-9-12.pdf
Beginning In 2014, the question, ""Physical activity: Adults participated in 150 minutes or 75 minutes of vigorous physical activity per week"" is asked in alternate survey years. Thus, there no data is available in 2014 but is available for 2015 and every other year onward.