(Reuters) -Starbucks CEO Brian Niccol's turnaround efforts showed signs of progress even as the coffee giant missed estimates for quarterly global comparable sales and profit as inflation and economic uncertainty hit demand in the United States.

But those efforts have been costly. Starbucks said its net income dropped 50% to $384 million in its fiscal second quarter. Adjusted earnings fell nearly 40% to 41 cents per share. That was lower than the 49-cent per share profit Wall Street forecast.