Summary of results of a linear mixed model explaining variation in egg volume (cm³) using the extended dataset that includes low-quality observations not containing information on egg position within the clutch and only clutches of three eggs (<i>N</i> = 184 eggs).

Model estimates, standard errors (SE), and their 95% confidence intervals (CI (95%)) are provided along with results from likelihood-ratio tests (χ2df = 1 and associated p-values) assessing the statistical significance of each predictor within the full model (i.e., a model containing all of the terms in the table below). Random effect standard deviation: “season” = 0 cm3, “group ID” = 0 cm3, “clutch ID” = 0.001 cm3, “mother ID” = 0.080 cm3. “Heat waves” (days above 35°C) and “Clutch size” were mean centered and scaled by one standard deviation prior model fit to improve model convergence. “Rainfall” and “Rainfall2” were fitted as orthogonal polynomial, and their estimates are not back transformed in this table (i.e., units do not refer to the real data scale). (DOCX)