Table 3.
Linear mixed models examining correlates of total workplace sitting time (min/8-h day).
| Empty model |
Block 1a |
Block 2b |
Block 3c |
|
|---|---|---|---|---|
| b (95% CI) | b (95% CI) | b (95% CI) | ||
| Intercept | 378.49 (368.36, 388.63) | 387.67 (357.21, 418.14) | 380.76 (349.88, 411.65) | 360.20 (310.30, 410.10) |
| Socio-demographic and health-related | ||||
| Age (years) | 0.10 (− 0.51, 0.72) | 0.34 (− 0.28, 0.96) | 0.33 (− 0.29, 0.94) | |
| Gender | ||||
| Male (ref: female) | 7.33 (− 4.68, 19.34) | 8.99 (− 3.09, 21.07) | 8.06 (− 4.04, 20.15) | |
| Marital status | p = 0.035† | p = 0.055† | p = 0.067† | |
| Married/de facto | Ref | Ref | Ref | |
| Separated/divorced/widowed | − 16.76 (− 32.00, − 1.51)* | − 15.90 (− 30.90, − 0.89)* | − 15.24 (− 30.17, − 0.31)* | |
| Never married | − 13.43 (− 28.25, 1.38) | − 11.58 (− 26.18, 3.03) | − 11.21 (− 25.74, 3.33) | |
| BMI | p = 0.014† | p = 0.007† | p = 0.010† | |
| Healthy (< 25 kg/m2) | Ref | Ref | Ref | |
| Overweight (25 − < 30 kg/m2) | − 9.44 (− 23.22, 4.35) | − 11.86 (− 25.50, 1.78) | − 10.86 (− 24.51, 2.79) | |
| Obese (≥ 30 kg/m2) | − 20.54 (− 34.42, − 6.67)** | − 22.06 (− 35.73, − 8.39)** | − 21.05 (− 34.70, − 7.39)** | |
| Work-related | ||||
| 1.0 FTE (ref: < 1.0) | − 9.95 (− 23.76, 3.86) | − 9.38 (− 23.20, 4.44) | ||
| Tenure at workplace | p = 0.012† | p = 0.008† | ||
| < 3 years | 16.72 (0.24, 33.20)* | 15.45 (− 0.97, 31.88) | ||
| 3–5 years | 20.31 (4.14, 36.49)* | 22.59 (6.37, 38.82)** | ||
| > 5 years | Ref | |||
| Cognitive-social | ||||
| Knowledge | 8.07 (− 2.55, 18.69) | |||
| Use of self-regulation strategies | − 5.76 (− 13.26, 1.75) | |||
| Random effects‡ | ||||
| Worksite (p-value) | p < 0.01 | p < 0.01 | p < 0.01 | p < 0.01 |
| Variance: worksite (between worksites) | 236.37 (62.36, 895.84) | 288.82 (85.76, 972.69) | 279.25 (81.89, 952.23) | 246.73 (68.25, 891.93) |
| Variance: residual (within worksite) | 1696.10 (1391.67, 2067.12) | 1563.13 (1282.61, 1905.01) | 1489.08 (1221.54, 1815.20) | 1471.79 (1207.10, 1794.51) |
| ICC | 0.122 (0.034, 0.355) | 0.156 (0.050, 0.394) | 0.158 (0.050, 0.400) | 0.144 (0.042, 0.388) |
| AIC | 2219.56 | 2216.70 | 2212.46 | 2212.89 |
| BIC | 2229.66 | 2247.00 | 2252.85 | 2260.01 |
| P vs previous block | p = 0.021 | p = 0.017 | p = 0.168 |
n = 214; * p < 0.05; ** p < 0.01; † p represents overall significance test for variable, ‡ Worksite specified as a random effect.
Note: ICC – Intracluster correlation coefficient; AIC – Akaike's Information Criterion; BIC – Bayesian Information Criterion. Data were collected in Victoria, Australia in 2012–13.
a
Work smoking status, ethnicity, non-work MVPA, education eliminated.
b
Occupational category eliminated.
c
Workspace satisfaction, job control, barrier self-efficacy, desired sitting level, perceived behavioral control, perceived organisational norms, overall stress eliminated.