Table 3.
Penalized Likelihood Estimates of Odds Ratios and (95% Confidence Intervals) from Multiple Logistic Regression Models Predicting Postnatal Depression from Physical Activity and Background Variables
| Physical Activity Measure | |||||
|---|---|---|---|---|---|
| Predictor | SBASa,b | Total Stepsc,d | Aerobic Stepsc,d | Moderate Activitye,f |
Vigorous Activitye,f |
| Age | 1.10 (0.99, 1.22) | 1.07 (0.97, 1.19) | 1.08 (0.98, 1.20) | 1.08 (0.98, 1.20) | 1.09 (0.98, 1.21) |
| Number of people in household | 0.93 (0.70, 1.19) | 0.89 (0.68, 1.13) | 0.88 (0.67, 1.13) | 0.90 (0.68, 1.14) | 0.91 (0.69, 1.16) |
| Number of live births | 0.85 (0.51, 1.38) | 0.96 (0.60, 1.52) | 0.95 (0.58, 1.54) | 0.84 (0.50, 1.35) | 0.84 (0.50, 1.35) |
| Depression during prior pregnancy(ies) | 3.87** (1.52, 10.80) | 3.06* (1.27, 8.01) | 3.21* (1.32, 8.51) | 3.01* (1.23, 7.98) | 2.86* (1.16, 7.64) |
| Weeks postpartum | 1.02 (0.95, 1.08) | 1.03 (0.97, 1.09) | 1.03 (0.97, 1.09) | 1.03 (0.97, 1.09) | 1.03 (0.97, 1.09) |
| MOS: Overall social support | 0.51** (0.31, 0.81) | 0.52** (0.32, 0.82) | 0.51** (0.32, 0.81) | 0.49** (0.30, 0.79) | 0.48** (0.29, 0.76) |
| Physical activity measure 1a | 0.79 (0.30, 2.01) | 1.00 (1.00 1.00) | 1.00 (1.00, 1.00) | 1.01 (0.98, 1.04) | 0.78 (0.19, 1.17) |
| Physical activity measure 2a | 0.17† (0.02, 0.85) | -- | -- | -- | -- |
Notes.
a
The 3 observed Stanford Brief Activity Scale (SBAS) categories are represented by two dummy variables with the first variable coding for the comparison of inactive (0) to light intensity activity (1) and the second variable coding for the comparison of inactive (0) to moderate intensity activity (1); all other physical activity measures are treated as continuous variables.
b
n = 137.
c
Pedometer-measured activity.
d
n = 136.
e
Accelerometer-measured activity.
f
n = 134.
†
p < .10.
*
p < .05.
**
p < .01.