Notes. σ_X is the measured cross-variance before any correction. The transfer function factor f (Eq. (A.11)) is dimensionless, all other quoted values in this table are in μJy/beam, where ‘beam’ refers to a fiducial Gaussian of 12.5 and 18 arcsec FWHM at 1.2 and 2 mm. In the case of 1.2 × 2 mm cross-confusion, it refers to the square root of the product of the two beams. Statistical uncertainties on the confusion come from the limits of the 68% confidence interval of the likelihoods. Uncertainties on the transfer function are given for reference but are negligible, and the estimate of the cosmic variance comes from 27 SIDES-UCHUU simulations that have been processed end-to-end. The final estimate of the confusion and its statistical error bars are from those of σ_X corrected by the transfer function. The quoted value and its statistical uncertainties (but not the cosmic variance) are in total uncertain by about 10% due to the uncertainty in the absolute calibration of the instrument (see Sect. 4.3). Note that the NIKA2 absolute calibration is derived from laboratory measurements and observations of Uranus. We applied the color correction factors given in the table to the final results, assuming a DSFG spectrum of ∼ν^3.5.