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Table 3 Ordinary least squares (OLS) regression predicting length of therapy

From: Antipsychotic patterns of use in patients with schizophrenia: polypharmacy versus monotherapy

   95% Confidence interval  
Covariate a Coef. (lower – upper) p-Value
Polypharmacy (reference = monotherapy) −106.638 (−117.179 – −96.096) <.001
Female (reference = male) −1.700 (−10.914 – 7.514) .718
Age 1.582 (1.198 – 1.965) <.001
Number of post-index psychiatric comorbidities of interest (reference = 0)     
  One −9.402 (−19.946 – 1.142) .081
  Two −38.278 (−52.526 – −24.031) <.001
  Three or more −67.391 (−87.620 – −47.163) <.001
Number of psychiatric medications post-index (reference = 0)     
  One −4.376 (−17.546 – 8.794) .515
  Two or more −12.682 (−25.211 – −0.153) .047
Number of somatic medications post-index (reference = 0)     
  One 20.108 (8.237 – 31.980) .001
  Two or more 13.279 (−1.724 – 28.283) .083
Constant 218.211 (197.930 – 238.492) <.001
R 2 0.148    
  1. aCovariates not shown include plan region, number of somatic comorbidities, and Deyo-Charlson comorbidity index score.