Dependences of star-formation rates SFR ((a), (c)) and of SFR ((b), (d)) on equivalent widths of the [O III] λ5007 and Hαλ6563 emission lines, respectively, for samples of CSFGs and high-z SFGs. The solid lines in (b) and (d) are the maximum likelihood relations. Galaxies denoted in (a) and (b) by black-filled circles are z ∼ 3.5 LBGs by Holden et al. (2016), z ∼ 1.3–3.7 galaxies with high EW([O III] + Hβ) by Tang et al. (2021), z ∼ 7 galaxies with high EW([O III] + Hβ) by Endsley et al. (2021) and z ∼ 6.6 galaxies with Lyα emission by Endsley et al. (2020), respectively. Galaxies represented in (c) and (d) by black-filled circles are z ∼ 5 SFGs by Rasappu et al. (2016). Green lines in (a) and (c) are the relations for z = 1.4–3.8 SFGs (Reddy et al. 2018). The meanings of symbols for SDSS CSFGs are the same as in Fig. 1.