Fraction of variable sources as a function of observed magnitude 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 magnitude distribution in the four bands. 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 the 1σ Wilson confidence intervals for each bin.