Have you plumped up during the lockdown? You’re not alone. The phenomenon is known as the “quarantine 15.” It refers to the 15 pounds (more or less) many have put on while they’ve been stuck at home. A new study gives a global scope of the issue. Research Director Nick Rizzo and his team at RunRepeat, an online shoe store known for its ranking system, surveyed nearly 20,000 people from 140 countries. They found that more than one-third (36 percent) gained more than five pounds over the past year. The United States had the most gainers (40 percent) and the United Kingdom had the least (28 percent). Globally, the quarantine 15 hit women harder. In comparison to males, females were more than 14 percent more likely to gain weight, and nearly 17 percent less likely to lose weight. Another poll from May found that nearly half of women gained weight …