Epidemiology Research International

Research Article

Determinants of Attrition to Follow-Up in a Multicentre Cohort Study in Children-Results from the IDEFICS Study

Table 2

Proportionate attrition and effect estimates for determinants of attrition in the IDEFICS study.


	Proportionate attrition	Model 1^a		Model 2^b
	Proportionate attrition	OR	99% CI	OR	99% CI

Sex
Male	32.8%	Reference
Female	32.3%	0.97	0.89, 1.06
Age group
Preschool	33.5%	1.15	1.07, 1.23	1.22	1.11, 1.34
School	31.8%	Reference		Reference
Region
Intervention	33.0%	Reference
Control	32.1%	0.96	0.88, 1.05
Weight status
Obese	31.7%	1.36	1.14, 1.62	1.28	1.07, 1.54
Overweight	35.9%	1.30	1.14, 1.49	1.27	1.10, 1.45
Normal weight	36.8%	Reference		Reference
Migration background
No	31.0%	Reference		Reference
Partly	33.0%	1.26	1.07, 1.48	1.23	1.04, 1.45
Full	40.6%	1.57	1.31, 1.89	1.15	0.91, 1.45
Missing	46.6%	2.44	1.98, 3.00	1.55	1.04, 2.32
Educational level
Low	41.4%	1.31	1.11, 1.53	1.19	1.01, 1.40
Medium-low	34.0%	Reference		Reference
Medium-high	31.4%	1.04	0.90, 1.20	1.06	0.92, 1.22
High	27.7%	0.84	0.75, 0.94	0.88	0.78, 1.00
Missing	46.8%	2.15	1.72, 2.69	1.09	0.72, 1.68
Family status
Two parents	30.9%	Reference		Reference
Single parent	36.3%	1.28	1.13, 1.45	1.21	1.06, 1.38
Missing	40.0%	1.96	1.66, 2.32	1.37	1.12, 1.67
Well-being
Low	37.5%	1.34	1.14, 1.59	1.26	1.07, 1.49
Medium-low	33.0%	1.18	1.00, 1.38	1.15	0.97, 1.35
Medium-high	29.0%	1.05	0.89, 1.22	1.04	0.89, 1.22
High	25.4%	Reference		Reference
Missing	39.7%	1.97	1.65, 2.36	1.46	1.19, 1.79
Weekly screen time
≤7 hours	31.6%	Reference		Reference
7 to ≤14 hours	31.9%	1.14	1.01, 1.27	1.11	0.99, 1.24
>14 hours	31.9%	1.16	1.03, 1.32	1.06	0.94, 1.21
Missing	42.3%	1.96	1.63, 2.35	1.10	0.86, 1.39
Junk food
Never	29.0%	Reference
Occasionally	29.7%	1.00	0.83, 1.23
Often	34.0%	1.00	0.82, 1.22
Missing	37.8%	1.53	1.23, 1.91
Soft drink available
Yes	38.7%	1.11	0.98, 1.25
No	30.0%	Reference
Missing	37.3%	1.97	1.66, 2.33
Sleep duration
≤11 hours	29.0%	0.86	0.72, 1.03
>11 hours	25.5%	Reference
Missing	35.3%	1.08	0.91, 1.29
Item non-response
No missing	30.8%	Reference
Low	39.0%	1.45	1.26, 1.68
High	40.4%	2.18	1.83, 2.58
Baseline participation
Low	27.3%	1.50	0.54, 4.16	1.33	0.46, 3.89
High	37.3%	Reference		Reference

CI: confidence interval; OR: odds ratio.
^aAdjusted for country, sex, and age group.
^bAdjusted for country, age group, weight status, parental education level, migration background, family status, well-being, screen time, and baseline proportionate participation.