I emailed the first author about this. She said it should be seconds for stair climbing, not minutes. The response to my query about the low-looking fatigue catastrophizing score made no sense to me so I asked for clarification, but haven't received any yet. By my calculations that's a minimum total score of 1 and a maximum of 5, yet the mean score is given as 0.9. The stair climbing duration SD didn't look very big: Stair climbing duration (seconds) 85.2 20.0 i.e around 2/3 of patients completed within 65-105 seconds. I'm not sure how that compares with the SD for healthy people. Similarly, the Fatigue Kinesiophobia figures weren't that big either: TS-fatigue 13.0 4.6 (min 8, max 36, 13 average equates to an average between strongly disagree and disagree with Kinesiophobia statements) TSK-CFS 32.0 5.3 (min 17, max 68, 32 equates to an average of 'disagree' with Kinesiophobia statements) So although the reported correlations are indeed strikingly high (albeit on a very small sample) it may be that rather weak levels of Kinesiophobia are correlating strongly with rather small differences in stair climbing times. Which isn't much to write home about.