Assessing the effects of an educational program for the prevention of work-related musculoskeletal disorders among school teachers

Table 3 Comparative pre- and post-intervention results on prevalence of WMSDs

Places	Pre-intervention		Six months post-intervention		12 months post-intervention		χ ²	P
Places	n	%	n	%	n	%	χ ²	P
Neck	222	63.43	204	62.20	148	46.40	24.099	0.000
Shoulder	183	52.29	174	53.05	133	41.69	10.470	0.005
Upper back	132	37.71	133	40.55	90	28.21	11.777	0.003
Elbow	46	13.14	46	14.02	37	11.60	0.864	0.649
Lower back	165	47.14	170	51.83	108	33.86	22.763	0.000
Wrist/hand	88	25.14	68	20.73	57	17.87	5.373	0.068
Hip/thigh	58	16.57	48	14.63	39	12.22	2.539	0.281
Knee	93	26.57	85	25.91	81	25.39	0.122	0.941
Ankle/foot	74	21.14	60	18.29	56	17.55	1.578	0.454