Obstructive sleep apnea did not statistically improve with weight loss surgery

Interesting study showing that weight loss from weight loss surgery did not significantly improve obstructive sleep apnea (OSA) severity compared to those on a standard weight loss program. The surgery patients lost more weight and had a greater reduction in OSA severity. But statistically, it was not different. I am not so sure about these results. It seems like the study was underpowered to show a significant effect. My experience is that weight reduction can reduce OSA significantly. I agree that these patients should not assume their OSA is improved just because they have lost weight. It is better to have a repeat sleep study to see if they still have OSA.