Attrition and generalizability in longitudinal studies: findings from a 15-year population-based study and a Monte Carlo simulation study

Table 2 Predictors of attrition from baseline to one- and 15- year follow-ups

	One-year follow-up				15-year follow-up
	Unadjusted		Adjusted^‡		Unadjusted		Adjusted^‡
Predictor	OR	95% CI	OR	95% CI	OR	95% CI	OR	95% CI
Women:
Age ^†	0.98	0.94-1.01	0.99	0.94-1.03	0.96*	0.93-0.99	0.99	0.96-1.02
Lives alone ^†	1.52	0.86-2.70	1.44	0.77-2.68	1.93*	1.15-3.23	1.32	0.75-2.33
Family finances	0.91	0.76-1.08	0.95	0.76-1.17	0.87*	0.76-0.99	0.97	0.83-1.15
Education	0.87	0.73-1.03	0.84	0.68-1.04	0.59*	0.51-0.68	0.62*	0.52-0.74
Not working ^†	1.35	0.94-1.96	1.32	0.86-2.03	2.01*	1.49-2.72	1.49*	1.06-2.10
Emotionality	1.05	0.88-1.25	1.06	0.84-1.33	1.03	0.90-1.18	0.98	0.82-1.16
Sociability	1.45*	1.20-1.75	1.56*	1.26-1.94	0.91	0.80-1.04	1.01	0.87-1.19
Activity	1.08	0.91-1.28	1.05	0.86-1.28	0.85*	0.75-0.97	0.95	0.82-1.11
Partner support	1.04	0.86-1.26	1.07	0.85-1.35	0.94	0.82-1.08	1.02	0.86-1.22
Emotional support from friends and family	0.97	0.81-1.15	0.86	0.70-1.05	0.88	0.77-1.01	0.93	0.79-1.08
Chronic stressors	1.00	0.84-1.19	1.03	0.81-1.31	1.00	0.87-1.14	1.01	0.84-1.21
HSCL	1.02	0.86-1.21	0.92	0.70-1.19	1.09	0.95-1.24	0.92	0.75-1.13
Children:
Activity	1.10	0.92-1.31	0.98	0.80-1.20	1.02	0.90-1.17	0.98	0.84-1.15
Sociability	1.05	0.88-1.25	1.00	0.81-1.22	0.94	0.82-1.07	0.94	0.80-1.10
Emotionality	1.01	0.84-1.20	1.04	0.85-1.27	1.09	0.96-1.25	1.16	1.00-1.36
Shyness	0.96	0.81-1.14	0.95	0.77-1.17	1.05	0.92-1.20	0.94	0.80-1.10

Predictors are standardized scores from the baseline questionnaire. N = 913.
* Significant at p <.05 before Bonferroni correction, Bold font = significant at p < .05 after Bonferroni correction. ^‡ N = 861 in the multiple regression analysis. (Partner support is left out of the multiple analysis reported here, because this reduced N to 779.) ^† unstandardized score.

ISSN: 1471-2458