Table 1.

Socio-demographic characteristics of the sample and descriptive statistics for the exposure and outcome variables

	n	%
Sex
Male	13,516	42.5
Female	18,271	57.5
Education levela
1	7,546	23.9
2	13,624	43.2
3	10,370	32.9
SEIFAb quintile
1 (low)	2,878	9.1
2	5,326	16.8
3	7,299	23.0
4	6,859	21.7
5 (high)	9,315	29.4
Employment status
Not working	8,388	26.4
Part time	8,572	27.0
Full time	14,809	46.6
Body mass index (BMI)
<18.5	296	1.0
18.5-25	11,798	39.3
25-30	11,925	39.8
≥30	5,973	19.9
Total sitting time (hours/day)
<4	8,050	26.4
4-8	14,029	46.0
8-11	6,124	20.1
≥11	2,271	7.5
Sitting time changec
No change or decreased (≤0)	19,325	65.5
Increased (>0)	10,171	34.5

^aUp to school or intermediate certificate ¹; completed high school/leaving certificate/ trade apprenticeship/certificate/diploma ²; university degree or higher ³.

^bArea-level socio-economic status.

^cChange between baseline and follow-up.