105 The short-term effectiveness of e-Exercise low back pain – a cluster RCT measures were available from 97.1% (101/104) of the patients in the stratified blended physiotherapy group and 99% (103/104) of the patients in the face-to-face physiotherapy group, and eligible accelerometer data were available from 84.6% (88/104) and 83.7% (87/104), respectively. Of the 208 patients, 4 (1.9%) ineligible patients (n=2, 50% in the stratified blended physiotherapy group and 2, 50% in the face-to-face physiotherapy group) were unjustified included, did not receive the allocated intervention and were therefore excluded from all analyses. At the 3-month follow-up, complete data on outcome measures were available from 86.5% (90/104) of the patients in the stratified blended physiotherapy group and 93.3% (97/104) of the patients in the face-to-face physiotherapy group, and eligible accelerometer data were available from 74% (77/104) and 76% (79/104) of these patients, respectively. Table 2 Baseline demographic and clinical characteristics for patients from the stratified blended physiotherapy group and face-to-face physiotherapy group (n=208). Characteristics Baseline Stratified blended physiotherapy (n=104) Face-to-face physiotherapy (n=104) Gender (female), n (%) 45 (43.3) 57 (54.8) Age (years), mean (SD) 48.10 (15.08) 47.26 (13.58) BMI (kg/m2), mean (SD) 25.78 (3.79) 26.31 (5.11) Presence of comorbidities (yes), n (%) 38 (36.5) 28 (26.9) Past LBPa surgery, n (%) None 100 (96.2) 101 (97.1) Lumbar fusion 0 (0.0) 1 (1.0) Lumbar discectomy 4 (3.9) 2 (1.9) Central sensitization (score 0-100), mean (SD) 30.88 (13.38) 30.17 (12.19) Educational level, n (%) Low 22 (21.2) 13 (12.5) Middle 33 (31.7) 36 (34.6) High 49 (47.1) 55 (52.9) Duration of LBP complaints, n (%) 0 to 6 weeks 37 (35.6) 49 (47.1) 6 to 12 weeks 11 (10.6) 19 (18.3) 12 weeks to 12 months 9 (8.7) 9 (8.7) > 12 months 47 (45.2) 27 (26) 5
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