Determinants of non-response in a longitudinal study of participants in the Women and Alcohol in Gothenburg project

Figures & data

Figure 1. Flow chart showing response status at each interview time for women in cohort I

Figure 2. Flow chart showing response status at each interview time for women in cohort II

Table 1. Associations between selected sociodemographic and health characteristics measured before the planned interview and non-response at follow-up interviews based on data from the Women and Alcohol in Gothenburg study: results from logistic regression

	Non-response at follow-up interview
	Cohort I		Cohort II
	T2	T3	T2	T3
	n= 51	n = 60	n = 137	n = 163
Sociodemographic and health variables ^a	Odds ratio (95%CI)	Odds ratio (95%CI)	Odds ratio (95%CI)	Odds ratio (95%CI)
Age in years (Cohort I)
35/45 vs. 25	0.99 (0.37-2.66)	0.21 (0.06-0.69)
55/65 vs. 25	0.74 (0.18-3.09)	0.44 (0.12-1.62)
Age in years (Cohort II)
25 vs. 20			0.89 (0.50-1.58)	1.79 (1.02-3.16)
Education
Basic vs. college/university	3.01 (1.06-8.51)	1.81 (0.58-5.68)	1.49 (0.60-3.69)	3.40 (0.87-13.34)
High school vs. college/university	0.91 (0.32-2.58)	1.07 (0.36-3.14)	1.08 (0.65-1.80)	1.28 (0.71-2.33)
Marital status
Unmarried vs. married/cohabiting	1.03 (0.41-2.58)	0.74 (0.27-2.00)	1.94 (1.10-3.42)	1.22 (0.65-2.28)
Employment status
Unemployed vs. employed	0.76 (0.23-2.45)	1.88 (0.60-5.92)	1.17 (0.69-2.00)	1.26 (0.64-2.48)
Lifetime depression
With vs. without	7.26 (1.64-32.23)	0.78 (0.14-4.33)	0.52 (0.21-1.25)	1.30 (0.55-3.11)
Self-rated physical health
Poor vs. good	1.87 (0.68-5.13)	3.38 (1.47-7.95)	0.90 (0.51-1.58)	0.70 (0.31-1.60)

^aAll variables were entered simultaneously into the model; T2, first follow-up interview; T3, second follow-up interview.

Table 2. Associations between alcohol use variables measured before the planned interview and non-response at follow-up interviews based on data from the Women and Alcohol in Gothenburg study: results from logistic regression

	Non-response at follow-up interview
	Cohort I		Cohort II
	T2	T3	T2	T3
	n= 51	n = 60	n = 137	n = 163
Alcohol use variables ^a	Odds ratio(95%CI)	Odds ratio(95%CI)	Odds ratio(95%CI)	Odds ratio(95%CI)
Frequency of alcohol use last month ^b
1-3 times in a month	0.37 (0.11-1.18)	0.33 (0.09-1.34)	1.15 (0.51-2.61)	1.05 (0.44-2.48)
2 or more times in a week//daily	1.90 (0.65-5.59)	0.70 (0.16-3.13)	0.74 (0.32-1.74)	1.26 (0.54-2.94)
Frequency of alcohol use last year ^c
1-3 times in a month	1.02 (0.26-3.98)	0.81 (0.23-2.88)	1.15 (0.51-2.61)	1.75 (0.83-3.69)
2 or more times in a week/daily	3.82 (0.94-15.39)	1.76 (0.47-6.62)	0.74 (0.32-1.74)	1.70 (0.80-3.61)
Amount of drinks consumed a typical day last year ^d
3-4 drinks vs. 2 or less	1.36 (0.46-4.07)	1.03 (0.35-2.95)	0.87 (0.43-1.74)	1.08 (0.56-2.07)
>4 drinks vs. 2 or less	2.01 (0.60-6.71)	0.45 (0.09-2.12)	1.23 (0.61-2.49)	1.04 (0.48-2.26)
HAC last month ^e
Yes vs. no	1.58 (0.37-6.63)	4.76 (1.20-18.91)	0.67 (0.28-1.55)	0.80 (0.26-2.43)
HED last year ^f
Yes vs. no	3.13 (1.11-8.88)	0.61 (0.18-2.03)	0.60 (0.32-1.12)	1.29 (0.68-2.45)
ADA ^g
Yes vs. no	1.10 (0.28-4.37)	0.49 (0.10-2.42)	0.82 (0.38-1.79)	0.83 (0.22-3.18)

^aEach alcohol use variable was adjusted for age, education, marital status, employment status, depression and self-rated physical health.

^bReference category is none.

^cReference category is none/less than once a month.

^dReference category is ≤2 drinks.

^eHAC, high alcohol consumption.

^fHED, Heavy episodic drinking.

^gADA, alcohol dependence and abuse; T2, first follow-up interview; T3, second follow-up interview.

Data availability statement

The data that support the findings of this study are available from the corresponding author, [C.A.N], upon reasonable request.