Table 3

Baseline distribution of neck-shoulder complaints and clinically verified shoulder disorders in four seniority groups of sewing machine operators

		Duration of exposure as a sewing machine operator(y)
		⩽2 (n=32)	2–10 (n=80)	10–20 (n=67)	>20 (n=59)
Neck-shoulder complaints (%):^3-151
None	22	29	24	12
Light	50	49	42	40
Moderate or severe	28	22	34	48
Subjects with verified shoulder disorder (%):
Myofascial pain syndrome	19	7	10	31
Rotator cuff tendinitis^3-165	0	1	6	15

↵3-165 p<0.001, χ² test for linear trend=12.85, df=1,
↵3-151 None=neck-shoulder pain score 0, light=neck-shoulder pain score 1–24, moderate or severe=neck-shoulder pain score ⩾24.