Derived abundance ratio N/O from rest-optical lines of the LyC22 galaxies (blue circles) and low-z samples as a function of O/H. The low-z star-forming galaxies and H II regions from the compilation of Izotov et al. (2023) and the LzLCS are shown by small black and gray symbols, respectively. Dash-dotted and dotted lines show the average trend observed in low-z star-forming galaxies, as parametrized by Vila-Costas & Edmunds (1993) and Nicholls et al. (2017), respectively. The dotted green line shows the solar value.