SFR derivation from [O II] using Kennicutt (1998) and a metallicity correction. Left panel: [O II]/Hα ratio (assuming Hα = 2.86Hβ) corrected for dust attenuation versus metallicity estimated using the Zaritsky et al. (1994) calibration for the VIPERS (blue) and GSWLC (density) samples, with their associated linear fit. Right panel: SFR derived from [O II] using the Hα calibration of Kennicutt (1998) and the attenuation-corrected [O II]/Hα expressed as a function of metallicity. The slope increases for both samples and the scatter decreases compared to the direct [O II] calibration (mean of 0.05 dex and scatter of 0.17 dex for VIPERS, 0.06 and 0.20 dex for GSWLC).