# Table 2

SWA time course variables derived from fitted exponential decay functions*
MDD HC MDD Females HC Females MDD Males HC Males
(N= 30) (N= 30) p (N= 19) (N= 19) p (N= 11) (N= 11) p
R2 0.63 0.55 -- 0.71 0.51 -- 0.66 0.65 --
SWA0 177.34 141.00 0.10 230.04 146.86 0.03 150.79 137.30 0.68
(CI) (143.41-211.27) (113.44-168.55) (176.43-283.66) (95.57-198.15) (89.50-212.09) (102.63-171.97)
r 0.0108 0.0063 0.18 0.0112 0.0053 0.15 0.0178 0.0082 0.16
(CI) (0.0060-0.155) (0.0017-0.0110) (0.0060-0.0163) (−0.0011-0.0116) (0.0057-0.0299) (0.0011-0.0154)
SWA 58.30 45.82 0.52 53.24 36.49 0.63 74.35 55.74 0.28
(CI) (41.86-74.74) (10.23-81.40) (33.41-73.08) (−33.48-106.47) (60.13-88.56) (22.47-89.02)

*Values derived from exponential functions that were fitted to the data using the equation SWAt = (SWA0 * e-rt) + SWA, in which SWAt is the SWA value at a given time point t, SWA0 represents the hypothetical SWA value at time 0, t indicates time (min) from sleep onset, r is the rate (min-1) of exponential decay, and SWA indicates the SWA value of the decay function’s asymptote. CI denotes the 95% confidence interval. R2 for the exponential function reflects goodness of fit.

Plante et al.

Plante et al. BMC Psychiatry 2012 12:146   doi:10.1186/1471-244X-12-146