Table 3

Predictors of Early and Late Dropouts and Overall Retention

Variables

β

SE

Odds ratio

95% confidence interval

P-value

Early dropout (Two-month post intervention): N = 124¹

CES-D

0.04

0.02

1.04

1.00, 1.08

0.03

Perceived stress

0.85

0.68

2.35

0.62, 8.88

0.21

Late dropout (Eight-month post intervention): N = 70²

Perceived stress

-3.72

1.39

0.20

0.00, 0.37

0.01

Positive affect

0.81

0.50

2.24

0.84, 5.97

0.10

Overall retention: N = 118³

Negative affect

-0.56

0.31

0.57

0.31, 1.03

0.06

Physical activity

-0.01

0.01

0.99

0.98, 1.00

0.18

SE = standard error. Reference group = retention

¹N = 124. Of 129 participants, 5 became pregnant after baseline data collection and were excluded from the analysis.

²N = 70. Using two-month post intervention data for analysis.

³N = 118. Of 129 participants, 11 became pregnant during the one-year study. These women were excluded from data analysis.

Chang et al. BMC Public Health 2009 9:424   doi:10.1186/1471-2458-9-424