Table 1.

Baseline characteristics

Variable	Usual care (n=27)	Internet intervention plus usual care (n=29)	Internet intervention plus physiotherapist support (n=27)
Female	15 (55.6%)	19 (65.2%)	17 (63.0%)
Age	60.3 (16.3)	54.5 (13.7)	59.3 (10.4)
Marital status
Married/partner	23 (85.2%)	19 (65.5%)	22 (81.5%)
Single	3 (11.1%)	4 (13.8%)	2 (7.4%)
Divorced/separated	0	5 (17.2%)	1 (3.7%)
Widow/widower	1 (3.6%)	1 (3.6%)	2 (7.4%)
White ethnicity	27 (100%)	26 (92.9%)	27 (100%)
Age left education	17.6 (2.7)	17.3 (1.7)	17.6 (2.8)
Employment status
Full time	7 (25.9%)	12 (41.8%)	6 (22.2%)
Part time	2 (7.4%)	4 (13.8%)	8 (29.6%)
Retired	13 (48.2%)	6 (20.7%)	8 (29.6%)
Self-employed	2 (7.4%)	3 (10.3%)	4 (14.8%)
Sickness/disability	2 (7.4%)	2 (6.9%)	1 (3.7%)
Other	1 (3.7%)	2 (6.9%)	0
Annual income (up to £)
10 000	2 (7.4%)	4 (14.3%)	3 (11.5%)
20 000	7 (25.9%)	6 (21.4%)	3 (11.5%)
40 000	9 (33.3%)	9 (32.1%)	10 (38.5%)
>40 000	9 (33.3%)	9 (32.1%)	10 (38.5%)
Expected reimprovement in LBP	5.86 (1.88)	5.22 (2.06)	5.74 (2.19)
Expected percentage improvement in LBP (item from the CEQ)	43.21% (25.53)	41.92% (21.17)	37.40% (25.50)
Median days of pain in the last 4 weeks (IQR) (item from the CEQ)	10 (6, 25)	10 (4, 21)	18 (5, 28)
Time since you had a whole month without pain
<3 months	5 (17.2%)	6 (21.4%)	5 (19.2%)
3–6 months	1 (3.5%)	2 (7.1%)	4 (15.4%)
7–12 months	5 (17.2%)	4 (14.3%)	6 (23.1%)
1–2 years	7 (24.1%)	4 (14.3%)	5 (19.2%)
3–5 years	4 (13.8%)	4 (14.3%)	3 (11.5%)
6–10 years	2 (6.9%)	4 (14.3%)	3 (11.5%)
>10 years	5 (17.2%)	4 (14.3%)	0
LBP-related disability (RMDQ) mean (SD)	6.8 (4.9)	6.6 (4.6)	7.7 (4.7)
STarT Back risk group
Low	16 (57.1%)	19 (67.9%)	14 (51.9%)
Medium	11 (39.3%)	6 (21.4%)	12 (44.4%)
High	1 (3.8%)	3 (10.7%)	1 (3.7%)

CEQ, Credibility and Expectancy Questionnaire; LBP, low back pain; RMDQ, Roland and Morris Disability Questionnaire.