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Table 2 Overview of the included (changes in) intrapersonal variables

From: Intrapersonal, social-cognitive and physical environmental variables related to context-specific sitting time in adults: a one-year follow-up study

 

Questionnaire item

Original answer category

Recoded variables for cross-sectional analyses (baseline)

Longitudinal analyses

Recoding (% or mean ± SD)

New variables based on recoding

Family situation

How would you describe your family situation?

B: 1 = single; 2 = having a partner, but living independently; 3 = living with a partner; 4 = married; 5 = widow/widower

0 [not living with a partner (=1/2/5) = 20.9 %]; 1 [living with a partner (=3/4) = 79.1 %]

-

-

Occupational classification

What is your occupational classification?

B: 1 = white collars; 2 = blue collars; 3 = others, i.e. household or no-paid job

Dummy1: 0 [others and white collars = 80.7 %]; 1 [blue collars = 19.3 %]

-

-

Dummy2: 0 [others and blue collars = 26.7 %]; 1 [white collars = 73.3 %]

Educational level

What is your highest achieved diploma or certificate?

B: 1 = primary school; 2 = secondary education; 3 = higher education, non-university; 4 = university

0 [low educational level (=1/2) = 47.8 %]; 1 [high educational level (=3/4) = 52.2 %]

-

-

Sex

What is your sex?

B: 1 = male; 2 = female

0 [female]; 1 [male]

-

-

Occupational status

At the moment I have/work/am/do …

B: 1 = full-time job; 2 = part-time job; 3 = household; 4 = unemployed/job-applicant; 5 = career interruption; 6 = retired; 7 = student

0 [not working (=3-7) = 11.0 %]; 1 [working (=1-2) = 89.0 %]

1-2 → 1–2 OR 3–7 → 3–7 (stable = 93.5 %); 1–2 → 3–7 (stop working = 4.9 %); 3–7 → 1–2 (start working = 1.6 %)

0 = stable

1 = stop working

2 = start working

FU: 1 = full-time job; 2 = part-time job; 3 = household; 4 = unemployed/job-applicant; 5 = career interruption; 6 = retired; 7 = student

Residential area

In which type of area do you live?

B: 1 = countryside; 2 = village or town; 3 = cities suburbs; 4 = city

0 [countryside and village/town = 31.5 %]; 1 [cities suburbs and city = 68.5 %]

1 → 1 OR 2 → 2 OR 3 → 3 OR 4 → 4 (stable = 94.4 %); 1–2 → 3–4 (increase = 1.1 %); 3–4 → 1–2 (decrease = 4.5 %)

0 = stable

1 = increase

2= decrease

FU: 1 = countryside; 2 = village or town; 3 = cities suburbs; 4 = city

Depressive symptoms

a) During the past month, have you often been bothered by feeling down, depressed, or hopeless?

b) During the past month, have you often been bothered by little interest or pleasure in doing things?

a) B: 1 = yes; 2 = no

b) B: 1 = yes; 2 = no

0 [no depressive symptoms (=answered “no” on both questions) = 79.6 %]; 1 [depressive symptoms (=answered “yes” on at least one of the questions) = 20.4 %]

B: Positive test (answered “yes” on at least one of the questions = 20.4 %); negative test (answered “no” on both questions = 79.6 %)

0 = stable

1 = developing depressive symptoms

2 = disappearance of depressive symptoms

a) FU: 1 = yes; 2 = no

b) FU: 1 = yes; 2 = no

FU: Positive test (answered “yes” on at least one of the questions = 20.0 %); negative test (answered “no” on both questions = 80.0 %)

Children living at home

How many of your children still live at home?

B: … child(ren)

FU: … child(ren)

0 [no child(ren) at home = 44.6 %]; 1 [yes, child(ren) at home = 55.4 %]

B: not having a child (28.4 %); not having a child still living at home (16.2 %); having child(ren) living at home (55.4 %)

0 = stable

1 = getting child(ren)

2 = no children living at home

FU: not having a child (23.9 %); not having a child still living at home (21.7 %); having child(ren) living at home (54.3 %)

Body Mass Index (BMI)

Self-reported height and weight

B: … cm/… kg

… kg/m2

/

follow-up BMI minus baseline BMI

FU: … cm/… kg

  1. Abbreviations: B baseline, FU follow-up
  2. “/” indicates that no recoding was performed. “-” indicates variables that were not included in longitudinal analyses