Histograms of the ratio of SSFR evaluated within the SDSS fibre to SSFR for the galaxy as a whole (log C(SF)) are shown for the barred galaxy sample (open histograms), and for the control sample matched in stellar mass, stellar mass surface density and g−i colour (red hatched histograms). The plots on the left show results for galaxies with weak bars (e_bar < 0.5), while the plots on the right are for galaxies with strong bars (e_bar > 0.5). The samples are further divided by stellar mass (log M_*, M_* is in units of M_⊙), stellar mass surface density (log μ_*, μ_* is in units of M_⊙ kpc⁻²), concentration (R₉₀/R₅₀), g−i colour, asymmetry index (A) and relative bar size (D_bar/D_disc) at the median value of each parameter as denoted in each plot. Only bar sample A galaxies are plotted.