137 Trajectories of Adherence to HBE recommendations among People With Low Back Pain Table 2 Comparison between identified trajectory classes based on baseline characteristicsa Patient Characteristics Class 1 Low Declining Adherence (n=21) Class 2 High Stable Adherence (n=78) Class 3 Low Increasing Adherence (n=74) P Between Groups Age (y), median (IQR) 45 (17.8) 47.7 (25.5) 49.1 (21.2) .78 Height (cm), median (IQR) 173 (10) 175 (12.8) 174.5 (14) .83 Weight (kg), median (IQR) 80 (12) 77.5 (22.8) 79 (22) .68 BMI (kg/m2), median (IQR) 25.1 (5.4) 24.9 (4.7) 26 (4.9) .32 Central sensitization (score = 0-100), median (IQR) 31 (25) 26 (15.8) 29 (18) .29 Physical functioning (score = 0-100), median (IQR) 22 (26) 18 (16) 18 (20) .84 Pain intensity (average score = 7 d, 0-10), median (IQR) 6 (3) 6 (3) 6 (3) .49 Fear-avoidance beliefs (score = 0-96), median (IQR) 25 (23) 20.5 (18) 24.5 (17) .20 Pain catastrophizing (score = 0-52), median (IQR) 12 (9.0) 8 (10) 8.5 (13.5) .51 Self-efficacy (score = 10-40), median (IQR) 32 (5) 34 (5.8) 32 (5.8) .79 Self-management ability (score = 0-100), median (IQR) 63.1 (14.6) 63.1 (16.9) 63.1 (19.3) .78 Health-related quality of life (score = 0-1), median (IQR) 0.85 (0.2) 0.89 (0.2) 0.89 (0.2) .46 Sex (female), n (%) 10 (47.6) 43 (55.1) 35 (47.3) .60b Educational level, n (%) .78b Low 5 (23.8) 15 (19.2) 10 (13.5) Middle 7 (33.3) 25 (32.1) 28 (37.8) High 9 (42.9) 38 (48.7) 36 (48.6) Duration of current LBP episode, n (%) .62 b 0-6 wk 9 (42.9) 29 (37.2) 34 (45.9) 6-12 wk 4 (19.0) 13 (16.7) 9 (12.2) 12 wk to 12 mo 1 (4.8) 5 (6.4) 9 (12.2) > 12 mo 7 (33.3) 31 (39.7) 22 (29.7) Intervention group, n (%) 12 (57.1) 41 (52.6) 34 (45.9) .57b a% = percentage of the total sample; BMI = body mass index; IQR = interquartile range; LBP = low back pain; bP from chi-square test. 6
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