Table 1.

Characteristics of participants in digitally delivered exercise and education treatment for low back pain (N=2593).

Variables			Values
Sociodemographic characteristics
	Female, n (%)		1915 (73.85)
	Age (years), mean (SD)		63.0 (11.0)
	Educational level, n (%)
		Have not graduated high school	221 (8.52)
		Graduated high school	953 (36.75)
		College/university degree	1419 (54.72)
	Occupational status, n (%)
		Working	1093 (42.15)
		Studying	20 (0.77)
		Sick leave full-time	67 (2.58)
		Sick leave part-time	47 (1.81)
		Retired	1311 (50.56)
		Unemployed	55 (2.1)
Baseline health-related characteristics
	BMI (kg/m2), mean (SD)		26.5 (4.4)
	Baseline pain, NRSa (0-10), mean (SD)		4.9 (1.9)
	Reported radiating pain (>0 NRS), n (%)		1630 (62.86)
	Pain medications for back pain during last month, yes, n (%)		1252 (59.36)b
	Problem severity such that surgery is desired, n (%)		138 (5.32)
	Presence of pain in other joints, n (%)		1956 (75.43)
	Depression or anxiety (any problem = level 2-5 EQ-5D-5L), n (%)		1351 (52.10)
	General health, NRS (0-10), mean (SD)		6.2 (1.6)
	Physical activity level, ≥150 min/week, n (%)		1065 (40.73)
	Motivation/readiness ruler to start exercising (NRS 0-10, not at all to extremely), mean (SD)		9.3 (1.3)
Treatment-related characteristics
	Adherence to treatment during 3 months:
		Proportion of daily exercises/educational texts completed, mean (SD)	83.9 (17.0)
		≥80% adherence, n (%)	1796 (69.26)
		≥90% adherence, n (%)	1300 (50.13)
	Number of chat interactions with the PTc during the treatment
		Messages received from the PT, mean (SD)	21 (12)
		Messages sent to the PT, mean (SD)	9 (7)
	Participated in peer support group, n (%)		866 (33.40)

^aNRS: numerical rating scale.

^bDue to technical issues in the app, the total is 2109.

^cPT: physiotherapist.