Dependences of specific star-formation rates sSFR ((a), (c)) and of sSFR ((b), (d)) on equivalent widths of the [O III] λ5007 and Hαλ6563 emission lines, respectively, for samples of CSFGs and high-z SFGs. Solid lines 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). Galaxies represented in (c) and (d) by black-filled circles are z ∼ 5 SFRs by Rasappu et al. (2016). Yellow and green solid lines in (a) represent relations of z ∼ 2 analogues for z > 6.5 galaxies (Du et al. 2020) and z = 1.4–3.8 SFGs (Reddy et al. 2018), respectively, whereas the relation for z = 1.4–3.8 SFGs (Reddy et al. 2018) in (c) is shown by the green line. The meanings of symbols for SDSS CSFGs are the same as in Fig. 1.