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Table 2 Multivariate analysis

From: Low back pain precedes the development of new knee pain in the elderly population; a novel predictive score from a longitudinal cohort study

  Model 1 (n = 4482) Model 2 (n = 4638)
Odds ratio 95% CI P values Odds ratio 95% CI P values Regression coefficient
Age
 Fifties Reference Reference  
 Sixties 1.54 1.31–1.81 < 0.001 1.54 1.32–1.80 < 0.001 0.431
 Seventies 2.40 1.94–2.96 < 0.001 2.35 1.91–2.88 < 0.001 0.852
Sex
 Male Reference Reference  
 Female 1.42 1.13–1.80 0.003 1.34 1.16–1.55 < 0.001 0.294
BMI
 < 25 Reference Reference  
 25≤ 1.67 1.41–1.99 < 0.001 1.66 1.40–1.96 < 0.001 0.504
Weight change        
 No change Reference     
 3 kg ≤ increase 1.26 1.06–1.50 0.008 1.27 1.08–1.50 0.005 0.240
 3 kg ≤ decrease 1.09 0.88–1.34 0.42 1.10 0.90–1.35 0.36 0.096
Alcohol consumption (unit per day)
 No or occasional drinker Reference     
 1 ≤ consump. < 2 0.89 0.72–1.09 0.26     
 2 ≤ consump. < 3 0.96 0.69–1.34 0.82     
 3≤ 0.48 0.23–1.01 0.054     
Smoking
 Never smoker Reference     
 Quitted 1.30 0.99–1.71 0.055     
 Current smoker 1.14 0.91–1.44 0.26     
Activity
Moderately active Reference     
 Sedentary 0.90 0.68–1.19 0.46     
 Active 1.10 0.94–1.29 0.24     
Mental health (points)
 20≤ Reference Reference  
 ≤ 19 1.34 1.21–1.59 < 0.001 1.34 1.21–1.59 < 0.001 0.325
Low back pain (points)        
 0 Reference Reference  
 1≤ 1.62 1.40–1.86 < 0.001 1.59 1.38–1.83 < 0.001 0.463
ABI
 1≤ Reference     
 0.9 ≤ ABI < 1 0.90 0.71–1.12 0.34     
 < 0.9 0.73 0.42–1.25 0.25     
hsCRP 1.00 1.00–1.00 0.69     
NTX 1.00 0.99–1.01 0.80     
CTX 1.00 1.00–1.00 0.80     
  1. 95% CI 95% confidence interval, BMI body mass index, ABI ankle-brachial pressure index, hsCRP high-sensitivity C-reactive protein, NTX cross-linked N-telopeptide of type I collagen (urine), CTX cross-linked C-telopeptide of type I collagen (urine)