Only two of six ozone timing papers supplied matched elevated-concentration contrasts in a 2024 data release

We tested the support for within-context ozone concentration comparisons of invertebrate development and reproductive-onset time in a 2024 public release. We selected 22 records from six papers and formed 17 matched series. Only three series from two European papers had more than one elevated concentration. High-to-low time changes were -4.17%, +17.75% and +3.22%. All three conditional simultaneous intervals included zero. Four North American papers gave no matched elevated-concentration contrast. One Finnish paper supplied 92.28% of within-series concentration variation under row weights. Region and period replication was not available. The result limits a concentration explanation for this timing subset; it does not establish zero effects or ozone safety. Selected reporting, mixed endpoints, uncertain experimental units and missing exposure duration limit inference. No climate interaction was tested. The package gives code, source hashes, aggregate results and independent numerical checks.

ozone · development time · ecological timing · observation bias · dose response · evidence support