Combined independent-group summary audit
Verified methods: 2026-11-02

Instructions: Save a copy and complete each blank. Use fictional or aggregate values only; never enter patient identifiers. Record unresolved issues instead of inventing answers. This is a planning aid, not expert approval.

SCOPE
Outcome, unit, time point and population: ______
Reason for combining groups: ______
Evidence groups are disjoint and independent: ______

EXTRACT SOURCE SUMMARIES
Group | n | mean | sample SD | source table/page
______ | ______ | ______ | ______ | ______
______ | ______ | ______ | ______ | ______
Check SD versus SE; check units; no missing denominators.

RECOMPUTE
Total N: ______
Weighted combined mean = sum(n × mean) / N: ______
Within sum of squares = sum((n−1) × SD²): ______
Between sum of squares = sum(n × (mean−combined mean)²): ______
Combined sample SD = sqrt((within+between)/(N−1)): ______

DECISION AND CHECK
Independent calculation and discrepancy resolution: ______
Do not substitute the average SD or pooled within-group SD.
Retained original groups and provenance location: ______

Project/version: ______  Completion date: ______