An expert-informed framework of school conditions potentially supporting adolescent physical activity habits: a three-stage consultation in China.

Expert participation declined across the three consultation stages, and the analyses were restricted to 16 complete cases.

• Of 25 experts approached, 23, 18, and 16 were reported to complete Stages 1, 2, and 3, respectively.
• The reported analyses used 16 complete cases.
• Seven earlier-stage contributors withdrew consent; their data are excluded and recorded as no longer retained, preventing full-stage reanalysis.

The indicator pool was consolidated from literature-derived and interview-derived items into 34 candidate indicators.

• Forty-five literature-derived provisional indicators and five interview-derived additions were consolidated into 34 candidates.
• Five theory-informed domains guided the interviews.
• A predominantly deductive qualitative analysis with a codebook specified before the interviews supported indicator refinement rather than independently establishing the domain structure.

Thirty-three of 34 candidate indicators met the prespecified importance-based retention rule; SPC9 did not.

• The retention rule, specified before rating, combined a mean ≥4.00, coefficient of variation ≤0.20, and ≥80% of ratings of 4 or 5.
• Importance, feasibility, and clarity were rated on five-point scales.
• Retained indicators received uniformly high importance endorsement.

Agreement among experts on the relative ranking of indicators was limited.

• Kendall's W was 0.115 for importance, 0.160 for feasibility, and 0.163 for clarity.
• The authors state the findings do not establish strong inter-expert consensus.

An exploratory importance-feasibility matrix assigned the 33 indicators to four quadrants, and quadrant assignment was unstable for a third of indicators.

• The sample-relative matrix assigned 10, 5, 10, and 8 indicators to its four quadrants.
• 11 of 33 indicators changed quadrant in at least one leave-one-expert-out analysis.
• The matrix was described as exploratory and sample-relative.

Stage 3 confirmation could not be fully documented, and cross-stage quantitative convergence was not assessed.

• Individual-level Stage 3 confirmation distributions were not available in the submitted analytic record.
• Quantitative convergence across stages was not assessed.
• Incomplete process records restrict interpretation.

The resulting framework specifies curricular, extracurricular, peer, cultural, and institutional school conditions that experts considered potentially relevant to supporting habit formation.

• The framework is for Chinese adolescents aged 12-18 years.
• Expert endorsement of conditions does not demonstrate habit formation.

The study has substantial limitations, and further work is called for.

• Limitations include complete-case selection, limited stakeholder representation, and incomplete process records.
• The findings do not establish a validated measurement instrument, actual habit formation, or causal effects.
• Needed: more complete source documentation, stakeholder co-design, and prospective measurement and implementation studies.