Primary outcome
SE
Our findings indicate the causal effect of IVF conception on overall NAPLAN z-score was indistinguishable from zero. The predicted outcome mean z-score and was 0.013 (SE 0.024) for IVF-conceived children and −0.016 (SE 0.002) for spontaneously conceived controls, with an adjusted mean difference of 0.030 (95% CI −0.018 to 0.077) (