Table 3.

Association of latent class-derived patterns of MSD and psychological problems score

	Class 1	Class 2	Class 3a
	More complaints in neck, shoulder, and joints (n = 46)	More complaints in back, upper back (n = 137)	Low complaints in all musculoskeletal sites (n = 175)
	OR (95% CI)	OR (95% CI)	Reference
Model 1	1.96	1.35	–
	(1.41, 2.71)	(1.07, 1.72)
Model 2	1.97	1.21	–
	(1.37, 2.81)	(0.93, 1.57)

Model 1, unadjusted odds ratios in the multinomial logistic model. Model 2, adjusted for age, marital status, doing exercise, smoking, job section, work hours, and body posture at work. ^aClass 3 as the reference category