Ozone egg-output spread had no clear common change in 11 papers from 1988-2019

We tested whether elevated ozone changes reported variation in insect egg output relative to its mean. We used 44 records from 11 papers in a 2024 public data release. The equal-paper coefficient-of-variation estimate was -1.96%, with a conditional 95% interval from -24.95% to +28.07%. A variance-to-mean ratio gave -16.79%, with interval -55.57% to +55.81%. Four USA and Europe period cells did not establish a shared increase. The early European cell had only one paper. Sample-size filters and a shared-author check left the CV result uncertain. The analysis uses corrections for both log mean and log SD. Unknown error origins, mixed count units, small samples, shared controls and selected reporting limit inference. Reported SDs need not describe individual insects. These results do not establish no effect or a climate-pollution interaction. The package gives code, aggregate evidence, checks, source hashes, retrieval instructions and a figure.

ozone · egg output · reproduction · variation · observation bias · coefficient of variation · regional comparison · null result