Comparison of N/O abundances derived following the direct method and the assumptions described in this work (x-axis) with those adopting the strong line calibrations of Cataldi et al. (2025a) based on JWST samples (in black; applicable for z > 1) and an SDSS sample (red, applicable at low z), and the calibration from Strom et al. (2017) (blue). All strong line calibrations used the extinction-corrected line ratio of [N II] λ6584/[O II] λλ3727,3729.