Consent to data linkage in a large online epidemiological survey of 18–23 year old Australian women in 2012–13

Table 2 Health Characteristics of Consenters and Non-consenters (N = 25,541)

Variables	N		Consenters N = 17,684	Non-consenters N = 7857	Chi-square p value
Self-rated health
Excellent	1554	%	67	33	0.02
Very good	8713	%	70	30
Good	10,750	%	69	31
Fair	3733	%	70	30
Poor	788	%	66	34
Psychological distress
Low	5134	%	69	31	0.56
Moderate	7437	%	69	31
High	7008	%	70	30
Very high	5950	%	69	31
Any major chronic conditions^a
Yes	7171	%	69	31	0.19
No	18,366	%	69	31	0.19
Smoker
Not a current smoker	20,410	%	69	31	0.98
Current smoker	5121	%	69	31	0.98
Alcohol consumption
Never drink alcohol	2139	%	65	35	< 0.01
1 to 7 drinks per week	20,419	%	70	30
8 to 14 drinks per week	2004	%	70	30
More than 14 drinks per week	969	%	68	32
Body mass index (kg/m²)
Underweight (< 18.5)	2051	%	69	31	0.88
Healthy weight (18.5–24.9)	14,711	%	69	31
Overweight (25–29.9)	4988	%	69	31
Obese (≥30)	3573	%	70	30
Physical activity
Inactive	1658	%	68	32	0.45
Low	6369	%	69	31
Moderate	5283	%	70	30
High	12,172	%	70	30

Missing data were no more than 1% of all variables for consenters and non-consenters
^a defined as any of diabetes, heart disease, hypertension, asthma, cancer other than skin cancer

ISSN: 1471-2288