# Table 4 Distribution of patients in the defined subgroups

Defined Trajectory Subgroup Prevalence (n) of patients in the chiropractic sample (n = 814) Prevalence (n) of patients in the general practice sample (n = 263) Posterior probability of belonging to each of eight LCA derived patternsa Number of days with pain per week, in weeks with any LBP, mean (SD) Pain intensity in weeks with any LBP, mean (SD) Total number of days with LBP during 43 weeks (301 days), mean (SD)
Severe ongoing 0.1% (1) 1% (2) Severe ongoing: pp. ≈ 1 6.9 (.16) 8.1 (1.6) 250 (88)
Moderate ongoing 0.1% (1) 0 Moderate ongoing daily: pp. ≈ 1 7 (0) 4.2 (0) 301 (0)
Mild ongoing 0.1% (1) 0.4% (1) Moderate ongoing not daily: pp. = .5
Moderate ongoing daily: pp. = .5
6.1 (.31) 3.0 (1.1) 200 (76)
Minor ongoing/recovered 16% (133) 8% (22) Recovery: pp. = .97/Late recovery: pp. = .18 2.2 (2.1) 1.3 (.4) 2 (22)
Severe fluctuating 2% (15) 11% (28) Severe ongoing: pp. = .77
Moderate ongoing not daily: pp. = .19
6.1 (1.3) 7.3 (.9) 239 (61)
Moderate fluctuating 6% (47) 15% (40) Moderate ongoing not daily: pp. = .57
Moderate ongoing daily: pp. = .36
5.2 (1.5) 5.1 (.6) 206 (69)
Mild fluctuating 9% (75) 14% (38) Moderate ongoing not daily: pp. = .62
Moderate ongoing daily: pp. = .24
Improvement w/ relapse: pp. = .13
4.0 (1.7) 3.2 (.7) 155 (81)
Minor fluctuating 2% (19) 1% (3) Moderate ongoing not daily: pp. = .41
Improved w/ relapse: pp. = .31
Moderate ongoing daily: pp. = .23
3.9 (2.1) 1.8 (.5) 143 (90)
Severe episodic 24% (196) 28% (74) Mild episodic: pp. = .31
Improvement w/ relapse: pp. = .25
Slow improvement: pp. = 0.23
3.3 (1.3) 4.2 (1.2) 51 (44)
Moderate episodic 16% (127) 14% (36) Mild episodic: pp. = .42
Slow improvement: pp. = .19
Late recovery: pp. = .15
Improvement w/ relapse: pp. = .11
2.6 (1.2) 3.0 (.7) 29 (28)
Mild episodic 13% (104) 3% (7) Mild episodic: pp. = .40
Late recovery: pp. = .26/Recovery: pp. = .14
Slow improvement: pp. = .12
1.9 (1.1) 1.9 (.5) 19 (26)
Minor episodic 0.6% (5) 1% (3) Late recovery: pp. = .50/Recovery: pp. = .25
Improvement w/ relapse: pp. = .13Mild episodic: pp. = .12
1.2 (.4) 1 (0) 6 (7)
Severe single episode 1.8% (15) 1% (3) Recovery: pp. = .87 4.3 (1.9) 6.4 (1.0) 6 (4)
Moderate single episode 2% (20) 1% (3) Recovery: pp. = .83 /Late recovery: pp. = .13 2.4 (1.2) 4.4 (.6) 3 (2)
Mild single episode 6% (46) 1% (3) Recovery: pp. = .55/Late recovery: pp. = .45 1.8 (1.0) 2.5 (.5) 2 (2)
Minor single episode 1% (9) 0 Recovery: pp. = .56/Late recovery: pp. = .44 1.1 (.2) 1 (0) 1 (1)
1. LCA Latent Class Analysis
2. aMean probability of patients in the trajectory subgroup belonging to each of the previously identified LCA derived trajectory patterns. Patterns with posterior probability <0.1 were not listed