Table 4:
Full model statistics are displayed for fast and slow spindle characteristics that were significantly predicted by independent variables (age, sex, race and site). Standardized Beta (β) and associated p-values for each variable are listed below the model statistics.+ Denotes where statistics for pubertal development scale (PDS) are reported, as it provided a marginally better fit that age (fast density only).
| Fast spindles | ||||||
|---|---|---|---|---|---|---|
| Frequency: R2 = .24, F(5,127) = 7.98, p<.001 | ||||||
| Amplitude: R2 = .27, F(5, 127) = 9.40, p<.001 | ||||||
| Duration: R2 = .31, F(5, 127) = 11.01 p<.001 | ||||||
| Density: R2 = .22, F(5, 127) = 6.72, p<.001 | ||||||
| Central sigma power (absolute): R2 = .25, F(5, 127) = 8.33, p <.001 | ||||||
| Central sigma power (relative): R2 = .12, F(5, 127) = 3.45, p =.005 | ||||||
| Frequency | Amplitude | Duration | Density | Absolute sigma |
Relative sigma |
|
| Age/PDS+ |
β = .17, p=.03 |
β = −.39, p<.001 |
β = −.35, p<.001 |
β = .32, p=.001+ |
β = −.39, p<0.001 |
β = .26, p=0.004 |
| Sex |
β = .19 p=.02 |
NS | NS | NS | NS | NS |
| Black | NS |
β = −.23, p=.009 |
NS | NS |
β = −.28, p=0.002 |
NS |
| Asian | NS | NS |
β = −.24 p=.002 |
β = .20 p=.019 |
NS | NS |
| Site |
β = −.32, p<.001 |
NS |
β = −.30, p=.001 |
β = .29, p=.002 |
NS | NS |
| Slow spindles | ||||||
| Amplitude: R2 = .29, F(5, 126) = 10.25, p<.001 | ||||||
| Duration: R2 = .13, F(5, 126) = 3.80, p=.003 | ||||||
| Frontal sigma power (absolute): R2 = .25, F(5, 126) = 8.53, p <.001 | ||||||
| Amplitude | Duration | Abs sigma | ||||
| Age/PDS |
β = −.37, p<.001 |
β = −.27, p=.004 |
β = −.32, p<.001 |
|||
| Sex | NS | NS | NS | |||
| Black |
β = −.23, p=.01 |
β = −.23, p=.02 |
β = −.20 p=.02 |
|||
| Asian | NS | NS | NS | |||
| Site | NS | NS | NS | |||