Q3 2018Q2 2018Q1 2018Q4 2017Q3 2017
Same-store sales growth4.2%4.0%5.5%5.5%5.6%
US same-store sales growth2.4%2.6%2.9%4.5%4.1%
Europe same-store sales growthN/AN/AN/AN/AN/A
APMEA same-store sales growthN/AN/AN/AN/AN/A
Other same-store sales growthN/AN/AN/AN/AN/A

Notes:Same-store sales, referred to by the company as "comparable sales," includes sales from company-operated restaurants open at least 18 months; Beginning in Q3 2015, the company changed its segment reporting structure from continental divisions, to divisions of market maturity