154 Chapter 7 Table 1 Demographic characteristics of the participating patients with low back pain. (n=173) Variable Overall (n=173) “Declining adherence” class (n=21) “Stable adherence” class (n=78) “Increasing adherence” class (n=74) Age (years), median IQR] 47.7 [35.2, 59.5] 45.0 [39.0, 56.8] 47.7 [35.9, 61.4] 49.1 [34.7, 56.0] Sex (female), n (%) 85 (49.1) 11 (52.4) 35 (44.9) 39 (52.7) Height (cm), mean (SD) 175.5 (9.7) 175.0 (7.3) 176.1 (9.7) 175.1 (10.3) Weight (kg), median [IQR] 80.0 [70.0, 90.0] 80.0 [73.0, 85.0] 77.5 [67.2, 90.0] 79.0 [71.0, 93.0] BMI, median [IQR] 25.5 [23.4, 28.1] 25.1 [23.4, 28.7] 24.9 [23.0, 27.7] 26.0 [23.7, 28.6] Education level, n (%) Low 30 (17.3) 5 (23.8) 15 (19.2) 10 (13.5) Middle 60 (34.7) 7 (33.3) 25 (32.1) 28 (37.8) High 83 (48.0) 9 (42.9) 38 (48.7) 36 (48.6) Duration of LBP (weeks), n (%) 0-6 weeks 72 (41.6) 9 (42.9) 29 (37.2) 34 (45.9) 6-12 weeks 26 (15.0) 4 (19.0) 13 (16.7) 9 (12.2) 12 weeks-12 months 15 (8.7) 1 (4.8) 5 (6.4) 9 (12.2) >12 months 60 (34.7) 7 (33.3) 31 (39.7) 22 (29.7) ODI, median [IQR] 18.0 [8.0, 28.0] 22.0 [8.0, 34.0] 18.0 [10.0, 26.0] 18.0 [8.0, 28.0] ODI change, median [IQR] -8.0 [-20.0, -1.0] -10.0 [-29.0, -1.0] -8.0 [-16.0, -2.0] -8.0 [-20.0, 0.0] NPRS, median [IQR] 6.0 [4.0, 7.0] 6.0 [4.0, 7.0] 6.0 [4.0, 7.0] 6.0 [4.0, 7.0] NPRS change, median [IQR] -2.0 [-4.0, -0.5] -2.0 [-4.0, 0.0] -2.0 [-5.0, -0.8] -3.0 [-4.2, -1.0] FABQ, median [IQR] 23.5 [15.0, 33.0] 25.0 [18.0, 41.0] 21.0 [13.0, 31.0] 24.5 [17.0, 34.5] PCS, median [IQR] 8.5 [4.0, 15.0] 12.0 [6.0, 15.0] 8.0 [4.0, 14.0] 9.5 [3.8, 17.0]
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