Results
Participants reported a median sitting time during work of 2 hours (120 minutes), which accounted for 31.0 ±
24.9% of overall sitting time with no difference in gen- ders. The age group 30–45 years had the longest sitting times at work among both men and women. Overall, the median work-related sitting time increased from 1 hour for 10 years of education (22.5 ± 23.5%) to 5 hours (45.2 ±
22.4%) for participants with university degrees. Concern- ing the cognitive variables, we found one gender-specific difference: women who agreed with the belief ‘When I sit for hours, I feel uncomfortable’ (see Table 1) had longer work-related sitting times.
Bivariate correlations of the sitting- and PA-related be- havioural variables were calculated (data not shown), and most correlations were small. The highest correla- tions were observed between work-related sitting time
and work-related PA MET-minutes/day−1 with r = −.422
(p < .001) in men and r = −.321 (p < .001) in women. Multiple linear regression analyses in men showed that
model 1 with the PA-related behavioural correlates (18%)
and model 3 with the socio-demographic correlates (13%) explained most of the variance (R2) in work-related sitting times (see Table 2). Concerning PA behaviour, we found that sitting time during work was negatively correlated
with work-related PA (β = −.43), suggesting increased sit- ting durations with less PA during work. Leisure-time physical activity was not a significant correlate. ‘Education’ (β = .29) and ‘income’ (β = .17) were both positively associ- ated with ‘sitting time during work’, that is, increased edu- cation and income levels were positively associated with