Time of Day Affected Pain Scores in the CBD Spinal-Cord-Injury Trial
Pain scores rose from morning to evening in the CBD spinal-cord-injury trial. Time of assessment was therefore part of the analysis, rather than an interchangeable detail.
Repeated ratings characterized the daily pattern
Participants recorded pain three times daily on scheduled weekdays during baseline and treatment. Across the modeled data, morning pain was lower than afternoon pain, and evening pain was highest. The analysis included time of day alongside treatment and phase.
The daily pattern was not itself a CBD effect
A time-of-day difference across observations does not show that CBD caused pain to rise or fall at a particular hour. It identifies a temporal feature that could complicate a comparison if one condition were assessed mainly in the morning and another mainly in the evening.
The controlled benefit retains its own estimate
The trial found a modest active-treatment pain advantage for CBD versus placebo. The separate daily pattern should not be substituted for that treatment contrast or used to manufacture a large drug effect from mismatched assessments. For an individual pain record, compare similarly timed ratings and preserve the dosing context. These subjective pain measurements did not establish a time-specific blood concentration threshold or a general rule about functional capacity.
Related analysis: the study’s broader findings and limitations.
