Minimally important differences for Patient Reported Outcomes Measurement Information System pain interference for individuals with back pain

Figures & data

Table 1 Sample characteristics of overall, low back pain, and depression groups at time 1

	Overall (n=414)		Depression (n=196)		Low back pain (n= 218)
Age	51.3±17.3 (n=413)		47.9±19.0 (n=195)		54.3±14.9
Sex
Male	148	35.8%	51	26.0%	97	44.5%
Female	265	64.0%	144	73.5%	121	55.5%
Unknown	1	0.2%	1	0.5%	0	0%
Ethnicity
White	329	79.5%	146	74.5%	183	83.9%
Nonwhite	78	18.8%	46	23.5%	32	14.7%
Unknown	7	1.7%	4	2.0%	3	1.4%
Marriage status
Married/living with partner in committed relationship	236	57.0%	83	42.3%	153	70.2%
Separated/divorced/widowed	93	22.5%	49	25.0%	44	20.2%
Never married	82	19.8%	62	31.6%	20	9.2%
Unknown	3	0.7%	2	1.0%	1	0.5%
PHQ-9 severity category
None/minimal (≥0 to <5)	73	17.6%	5	2.6%	68	31.2%
Mild (≥5 to <10)	118	28.5%	53	27.0%	65	29.8%
Moderate (≥10 to <15)	111	26.8%	58	29.6%	53	24.3%
Moderately severe (≥15 to <20)	70	16.9%	50	25.5%	20	9.2%
Severe (≥20 to ≤27)	39	9.4%	30	15.3%	9	4.1%
Unknown	3	0.7%	0	0%	3	1.4%
Average back pain severity category
None/mild (≥0 to ≤3)	130	31.4%	108	55.1%	22	10.1%
Moderate (≥4 to ≤6)	145	35.0%	52	26.5%	93	42.7%
Severe (≥7 to ≤10)	138	33.3%	35	17.9%	103	47.2%
Unknown	1	0.2%	1	0.5%	0	0%

Notes: Percentages may not total 100 due to rounding. Data presented as mean ± SD or number and percentage.

Abbreviations: PHQ-9, Patient Health Questionnaire-9; SD, standard deviation.