Table 10. Sequential multiple regression analysis involving neck pain intensity with sick leave as the criterion variable.
| Variable, n = 201 | Model 1 | Model 2 | Model 3 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| B (95% Cl) | SEB | β (p value) | B (95% Cl) | SEB | β (p value) | B (95% Cl) | SEB | β (p value) | ||
| Weight of load (kilogram) | 0.01(-0.03–0.04) | 0.02 | 0.02(0.75) | 0.00(-0.03–0.03) | 0.02 | 0.01(0.87) | 0.00(-0.03–0.03) | 0.02 | 0.01(0.92) | |
| Duration of load carriage (number of hours per day) | 0.21(0.01–0.40) | 0.10 | 0.15(0.04) | 0.21(0.01–0.41) | 0.10 | 0.15(0.04) | 0.21(0.01–0.41) | 0.10 | 0.16(0.04) | |
| Twisted neck posture (yes) (No = reference) |
0.84(-0.56–2.25) | 0.71 | 0.09(0.24) | 0.53(-0.98–2.04) | 0.77 | 0.05(0.49) | 0.51(-1.01–2.04) | 0.77 | 0.05(0.51) | |
| Neck posture duration (number of hours per day) | -0.03(-0.08–0.02) | 0.03 | -0.08(0.27) | -0.03(-0.08–0.02) | 0.03 | -0.08(0.26) | -0.03(-0.08–0.02) | 0.03 | -0.08(0.26) | |
| Taking additional breaks (No) (Yes = reference) | 0.31(-0.59–1.20) | 0.45 | 0.05(0.50) | 0.27(-0.69–1.22) | 0.48 | 0.04(0.58) | ||||
| Unexpected events (Yes) (No = reference) | 0.11(-1.57–1.80) | 0.85 | 0.01(0.90) | 0.05(-1.72–1.82) | 0.90 | 0.00(0.96) | ||||
| Order and pace control (No) (Yes = reference) |
0.01(-0.77–0.79) | 0.39 | 0.00(0.98) | -0.02(-0.83–0.79) | 0.41 | -0.00(0.97) | ||||
| Task dependency (yes) (No = reference) |
-0.02(-0.81–0.77) | 0.40 | -0.00(0.96) | -0.07(0.95–0.81) | 0.45 | -0.01(0.88) | ||||
| Time pressure (yes) (No = reference) |
0.46(-0.32–1.24) | 0.40 | 0.09(0.24) | 0.45(-0.34–1.24) | 0.40 | 0.09(0.26) | ||||
| Neck pain intensity | 0.03(-0.18–0.23) | 0.10 | 0.03(0.81) | |||||||
| R2 | 0.03 | 0.04 | 0.05 | |||||||
| R2 change | 0.03 | 0.01 | 0.004 | |||||||
| Adjusted R2 | 0.01 | -0.04 | -0.05 | |||||||
| F (4, 196) = 1.522(0.197) | F (9, 191) = 0.909(0.519) | F (10, 190) = 0.902(0.533) | ||||||||
B-unstandardised beta, β-standardised beta, SEB-Standard error of beta. B-unstandardised beta, β-standardised beta, SEB-Standard error of beta. Taking additional breaks = Can you usually take breaks in your job in addition to the scheduled breaks? Unexpected events = Do you often find that you cannot work because of unexpected events, such as machine break down or material not delivered? Order and pace control = Can you usually control the order and pace of your tasks? Task dependency = Is the order and pace of your tasks usually dependent on others (machines, computers, customers)? Time pressure = Do you usually work under time pressure and deadlines?