showed a trendp = 0.091
Analysis of the primary endpoint 6MWD with O 2 administration showed a trend in improvement for all patients receiving LTOT (all patients: 35 ± 81.6 m improvement by LTOT; p = 0.091) and for the intervention vs. control group (O 2 group 47.8 ± 88.9 m vs. control − 11.5 ± 21.4 m).