PER3 VNTR genotypes do not differ significantly across overall average MSF (Figure 3; F2,266 = 3.1, p = 0.737), sleep disturbance (F2,865 = 1.45, p = 0.236), or depression scores (F2,540 = 0.07, p = 0.929). Here, PER3 is linked to depressive disorder.