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Table 5 Likelihood of Mono- versus Polydrug Abuse by Demographic Variables and Study Years (N = 69,891)

From: Mono- versus polydrug abuse patterns among publicly funded clients

  Total Users Monodrug Users Polydrug Users   
  N = 69,891 n = 35,875 (51.3%) n = 34,016 (48.7%) Odds Ratio
Variable N % n % n % ORa 95% CI
Gender         
   Male 48,168 68.9 24,646 51.2 23,522 48.8 0.979c 0.948–1.011
   Female 21,723 31.1 11,229 51.7 10,494 48.3 1.021c 0.989–1.055
Ethnicity         
   Caucasian 46,910 69.2 26,218 55.9 20,692 44.1 1.957b 1.893–2.023
   African American 20,393 30.1 7,941 38.9 12,452 61.1 0.504b 0.487–0.521
   Other 495 0.7 269 54.3 226 45.7 1.154ns 0.967–1.379
Age         
   <18 6,955 10.0 4,525 65.1 2,430 34.9 1.876b 1.782–1.976
   18–24 10,701 15.3 5,111 47.8 5,590 52.2 0.845b 0.811–0.880
   25–34 20,671 29.6 9,347 45.2 11,324 54.8 0.706b 0.683–0.730
   35–44 21,893 31.3 10,833 49.5 11,060 50.5 0.898b 0.870–0.927
   45–54 8,266 11.8 4,931 59.7 3,335 40.3 1.466b 1.399–1.536
   ≥ 55 1,404 2.0 1,127 80.3 277 19.7 3.950b 3.461–4.509
Residential Area         
   Urban 35,062 50.2 17,035 48.6 18,027 51.4 0.802b 0.779–0.826
   Rural 34,829 49.8 18,840 54.1 15,989 45.9 1.248b 1.210–1.285
Year         
   1998 9,911 14.2 4,645 46.9 5,266 53.1 0.812b 0.778–0.847
   1999 9,123 13.1 4,327 47.4 4,796 52.6 0.836b 0.800–0.873
   2000 9,598 13.7 5,293 55.1 4,305 44.9 1.194b 1.144–1.247
   2001 10,214 14.6 5,618 55.0 4,596 45.0 1.189b 1.139–1.240
   2002 9,891 14.2 4,885 49.4 5,006 50.6 0.913b 0.875–0.953
   2003 10,738 15.4 5,711 53.2 5,027 46.8 1.092b 1.048–1.138
   2004 10,416 14.9 5,396 51.8 5,020 48.2 1.023ns 0.981–1.066
  1. aOdds ratio of being a mono- versus a polydrug user in comparing a specific level of client demographics to all other demographic features. Odds in this table are calculated for the odds of being a mono vs. polydrug abuser, not for being male rather than female.
  2. bp < 0.0001.
  3. cp < 0.10.
  4. nsNot significant.