Table 5 Univariate and multivariate risk ratios (95% CIs) of the association between sex specific tertiles of physical capacity and shoulder pain, SMASH, 1994–97 (n = 1259).

Physical capacity	Total events/total number at risk*	Crude RR (95% CI)†	Adjusted RR (95% CI)
Isokinetic lifting strength	High (62/1030)	1.00	1.00‡
neck/shoulder muscles	Moderate (73/1070)	1.25 (0.98 to 1.59)	1.16 (0.91 to 1.46)
	Low (71/1028)	1.34 (1.06 to 1.70)	1.16 (0.92 to 1.46)
Static endurance shoulder elevators	High (77/1091)	1.00	1.00§
	Moderate (73/1097)	1.05 (0.83 to 1.32)	0.86 (0.69 to 1.07)
	Low (63/1091)	1.17 (0.93 to 1.46)	0.88 (0.71 to 1.11)

*Summarisation of occurrence annually during follow up divided by a summarisation of all workers at risk annually during follow up.

†RR, risk ratio; CI, confidence interval. Including the covariate duration of follow up.

‡Adjusted for duration of follow up, age, and length.

§Adjusted for duration of follow up, age, comorbidity of low back or neck pain, previous shoulder pain, and the number of sports participation in the past.