Application of variance ratios to assess heterogeneity of spinal manipulative therapy for chronic low back pain: A meta-epidemiological study.
Adam Babitts, Carina A Staab, Andrew Humbert and 4 others
PMID 41467479WHAT IT FOUND
Spinal manipulative therapy did not show greater variability in patient response than sham treatment for chronic low back pain.
This suggests there is no strong evidence that specific subgroups of patients respond differently to the therapy compared to others.
Key findings
01Pooled analysis found no significant difference in the variability of pain and function outcomes between spinal manipulative therapy and sham groups.
02The study found no evidence to support the presence of heterogeneity of treatment effect, meaning it is unlikely that certain subgroups respond significantly better or worse than others.
03While the primary focus was on variability, the updated meta-analysis showed a small benefit in function for spinal manipulative therapy at 1 and 3 months, but this average effect was not driven by subgroup responders.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The number of trials comparing SMT to sham SMT was small, leading to wide confidence intervals and low precision. The included studies were generally of low to very low quality with small sample sizes. Definitions of SMT and sham SMT were broad, potentially mixing mechanistically different interventions. Blinding of participants and providers was difficult or absent in many trials, which can affect the interpretation of sham responses. Sham interventions were poorly described and varied widely, making it hard to ensure they were truly inert.
Declared interests
The authors declared no conflicts of interest. The study was supported by the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIH).
The easy way to misread this
Do not interpret the lack of significant variance ratios as proof that no patient ever responds differently to spinal manipulative therapy. The study only shows that, on a group level, the spread of outcomes is not statistically different from sham treatment; individual variability may still exist but was not detected as a distinct subgroup pattern.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →