Table 4.

Comparison of the statistical mean of scores for theory of planned behavior constructs and manual material handling in both groups before and after intervention (n=140)

Variable	Mean±SD		t, P
	Case	Control
Attitude
Before	25.18±4.09	24.38±3.59	−1.229, 0.221
After	27.75±3.53	24.65±3.45	−5.249, <0.001
t, P	−8.470, <0.001	−1.315, 0.193
Subjective norms
Before	13.02±2.62	13.27±2.10	0.604, 0.547
After	14.41±2.03	13.3±2.18	−3.121, 0.002
t, P	−6.183, <0001	−0.341, 0.734
Perceived behavioral control
Before	11.00±3.03	10.98±2.85	−0.029, 0.977
After	13.48±2.16	10.95±2.75	−6.033, <0.001
t, P	−10.050, <0.001	0.424, 0.673
Behavioral intention
Before	8.37±2.47	8.51±2.05	0.375, 0.708
After	10.45±1.81	8.78±1.87	−5.374, <0.001
t, P	−7.567, <0.001	−1.260, 0.06
MMH
Before	38.30±6.45	38.34±7.42	0.036, 0.971
After	44.20±6.01	38.57±6.99	−5.11, <0.001
t, P	−9.863, <0.001	−1.460, 0.149

SD=Standard deviation, MMH=Manual material handling