Responsiveness and minimum important change of the Oswestry Disability Index in Italian subjects with symptomatic lumbar spondylolisthesis

Journal of Orthopaedics and Traumatology

Official Journal of the Italian Society of Orthopaedics and Traumatology

Table 1 Characteristics of the sample

Variable	Category	N	%
Age (years) in classes	18–24	19	12.7
	25–29	11	7.3
	30–34	13	8.7
	35–39	16	10.7
	40–44	17	11.3
	45–49	12	8.0
	50–54	15	10.0
	55–59	13	8.7
	60–64	17	11.3
	>65	17	11.3
Marital status	Married	91	60.3
Marital status	Unmarried	60	39.7
Work activity	Student	16	10.6
	Employee	65	43.0
	Self-employed	26	17.2
	Retired	24	15.9
	Houseworker	19	12.6
	Unemployed	1	0.7
Education	Elementary school	4	2.6
	Mid-school	13	8.6
	Upper school	74	49.0
	University	60	39.7
Smoker	Yes	32	21.2
Smoker	No	119	78.8
Level of spondylolisthesis	L5/S1	113	74.8
	L4/L5	36	23.8
	L4/L5 and L5/S1	2	1.3
Type of spondylolisthesis	Isthmic	102	67.5
Type of spondylolisthesis	Degenerative	49	32.5
Grade of spondylolisthesis	I	123	81.5
	II	27	17.9
	III	1	0.7
	IV	–	–
Pain duration in months	0–1	22	14.6
	2–3	22	14.6
	>3	107	70.9
Referred pain	Yes	74	49.3
Referred pain	No	76	50.7
Drugs^a	Antidepressants	7	4.6
	Analgesics	29	19.2
	NSAIDs^b, steroids	12	8
	Muscle relaxants	1	0.7
Comorbidities^c	Heart disease	4	2.6
	Respiratory disease	2	1.3
	Enteric disease	8	5.2
	Endocrinal disease	2	1.3
	Renal disease	1	0.7
	Orthopedic dysfunction	9	5.9
	Anxiety/depression	9	5.9