Cost-effectiveness of providing patients with information on managing mild low-back symptoms in an occupational health setting

Table 2 Results of the study outcome variables

Outcomes/analysis	Combined		Booklet		NC		Total		Combined vs. NC			Booklet vs. NC
Outcomes/analysis	mean	SD	mean	SD	mean	SD	mean	SD	MD	95 % CI	p	MD	95 % CI	p
Main analysis^a
PHI	3.0	3.6	2.0	2.9	4.5	3.8	3.1	3.6	-1.5	-2.8 – -0.3	0.01	-2.5	-3.8 – -1.3	0.00
LBP	21	22	20	20	23	19	21	20	-2	-9 – 6	0.86	-3	-11 – 4	0.51
SA first year	12	22	12	18	16	30	13	24	-5	-13 – 4	0.39	-4	-13 – 4	0.56
SA second year	16	38	12	34	16	23	15	32	0	-12 – 11	1.00	-4	-15 – 8	0.74
SA total in two years	27	50	24	48	32	43	28	47	-5	-22 – 12	0.76	-8	-25 – 9	0.50
HC costs in 12 months, €	195	700	108	142	303	577	199	530	-108	-297 – 82	0.37	-195	-382 – -7	0.04
Complete case analysis^b
PHI	2.6	3.8	1.5	3.1	4.1	4.1	2.6	3.8	-1.4	-3.0 – 0.1	0.10	-2.6	-4.2 – -0.9	0.00
LBP	20	23	17	22	23	22	20	22	-2	-12 – 8	0.87	-5	-15 – 4	0.41
SA first year	13	25	12	19	13	20	13	22	0	-10 – 10	1.00	-2	-11 – 8	0.93
SA second year	16	42	13	39	17	23	15	37	-1	-17 – 15	0.99	-4	-20 – 12	0.84
SA two years	29	55	25	54	30	32	28	49	-1	-23 – 21	0.99	-5	-27 – 16	0.83
HC costs in 12 months, €	188	808	73	151	370	730	196	633	-182	-457 – 93	0.26	-297	-572 – -22	0.03

^aMain analysis includes 264 participants in Combined (89), Booklet (92) and NC (83) groups
^bComplete case analysis includes 185 participants in Combined (67), Booklet (67) and NC (51) groups
The main analysis includes multiply imputed data of 264 cases and complete case analysis includes the original, available data (n = 185). Table shows the means and standard deviations in all study groups and the group comparisons between intervention groups (Combined and Booklet) and control (NC natural course group). [Mean, standard deviation (SD), mean difference (MD), 95 % confidence interval (95 % CI), p-value of the group comparison, PHI Physical impairment by the Roland-Morris 18-item Disability Questionnaire (range 0–18), LBP low back pain in Visual Analogue Scale (VAS, range 0–100 mm), SA sickness absence (days), HC health care]
Figures are bolded when considered statistically significant

ISSN: 1471-2458