Have refugees caused a gender imbalance in Sweden? It has been reported that there are 123 boys for every 100 girls aged between 16 and 17 in Sweden. In China, the ratio is 117 boys to 100 girls. We explore if the numbers add up and why this might be.

(Photo: People hold a 'Refugees Welcome' banner in Stockholm. Credit: Jonathan Nackstrand/AFP/Getty Images)