Table 3.

Internal consistency verified by the Kuder–Richarson coefficient of reliability (n = 312).

Construct	Subscale	Items	KR20	95% CI
Musculoskeletal trouble in neck region	All items in neck	NSQ (1,2,3,5a,5b,7,8) + GQN (1,2,3)	0.817	0.786–0.846
	Severity of symptoms	NSQ (1,2,7,8) + GQN (1,3)	0.774	0.732–0.811
	Impact on activities	NSQ (3,5a,5b) + GQN 2	0.737	0.686–0.782
Musculoskeletal trouble in shoulder region	All items in shoulder	SSQ (9,10,11,12,14a,14b,16,17) + GQS (1,2,3)	0.873	0.851–0.893
	Severity of symptoms	SSQ (9,10,12,16,17) + GQS (1,3)	0.856	0.830–0.879
	Impact on activities	SSQ (11,14a,14b) + GQS 2	0.783	0.741–0.820
Musculoskeletal trouble in low back region	All items in low back	LBSQ (1,2,3,5a,5b,7,8) + GQLB (1,2,3)	0.839	0.811–0.865
	Severity of symptoms	LBSQ (1,2,7,8) + GQLB (1,3)	0.789	0.751–0.824
	Impact on activities	LBSQ (3,5a,5b) + GQLB 2	0.749	0.700–0.792

KR20 of the general questionnaire = 0.835 (95% CI: 0.807-0.860).KR: Kuder–Richarson; NSQ: Neck specific questionnaire; GQN: General questionnaire, neck; SSQ: Shoulder specific questionnaire; GQS: General questionnaire, shoulders; LBSQ: Low back specific questionnaire; GQLB: General questionnaire, low back. CI: confidence interval.