showed a trendP = 0.077
Age was predicted by the mean amplitude of fast spindles (GLMM, F 1,8 = 27.608, P = 0.001), which decreased with years of age; was predicted by a decrease in their density (GLMM, F 1,8 = 6.454, P = 0.035), while frequency showed a trend to increase with age (GLMM, F 1,8 = 4.132, P = 0.077).