Fraction of variable sources per redshift bin in each NIR band YJHK_s. The top panel corresponds to the ultra-deep stripes and the bottom panel to the deep stripes. In both cases, the upper subpanels show the redshift distribution of type 1 (blue, hatched) and type 2 (orange, filled) AGNs. The lower subpanels display the variability fraction in each band, where different markers indicate the NIR bands (circles: Y, squares: J, triangles: H, diamonds: K_s), and solid and dashed lines distinguish type 1 and type 2 AGNs, respectively. Error bars represent 1σ Wilson confidence intervals, which are asymmetric and more appropriate for binomial proportions, especially in bins with small number statistics.