PMC full text: | Published online 2015 Aug 19. doi: 10.1186/s12891-015-0632-0
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Table 4
Responders (N = 249/93)b | Future pain intensity (N = 262/93)b | ||||||
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Independent variables | OR | (95 % CI) | P-value | β | (95 % CI) | P-value | |
Dose (per 6 spinal manipulation visits) | 1.14 | (0.95, 1.37) | 0.150 | −0.07 | (−1.35, 1.21) | 0.910 | |
Time (in weeks) | 1.08 | (1.02, 1.14) | 0.004 | ||||
Pain/Disability | |||||||
Pain intensity | 0.64 | (0.51, 0.80) | <0.001 | 10.7 | (8.84, 12.56) | <0.001 | |
Days with pain (last 4 weeks) | 0.57 | (0.46, 0.70) | <0.001 | ||||
Objective Physical Exam | |||||||
LBP: right – left lateral bending | 0.76 | (0.63, 0.92) | 0.005 | ||||
LBP: right lateral bending | 2.95 | (1.21, 4.69) | 0.001 | ||||
Performance metricsc | AUC | (95 % CI) | RMSE | (95 % CI) | R2 | (95 % CI) | |
Training set | 0.750 | 16.3 | .366 | ||||
Test set | 0.665 | (0.58, 0.74) | 17.5 | (15.0, 20.1) | .261 | (7.5, 43.2) |
aVariables were selected into the regression models using forward selection among variables with p < .05 in the univariate analysis; dose was forced into the models. Independent variables were standardized except for dose (scale unit = 6 visits) and time (scale unit = 1 week). Lower scores were favorable for pain and days with pain
bThe first number is the sample size for the model in the training set and the second number is the N for the test set
cChance performance is indicated by 0.5 for AUC. RMSE is the standard deviation of the error in prediction of future pain intensity evaluated on the 0 – 100 pain scale. R 2 is the proportion of the variance in pain intensity explained by the independent variables in the model. Confidence intervals are given for the test set only