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Table 1 Comparison of socio-demographic characteristics among Powder Cocaine Users, Crack Cocaine Users and Dual Users groups.

From: Concurrent crack and powder cocaine users from Sao Paulo: Do they represent a different group?

  Powder Cocaine Users Crack Cocaine Users Dual Users Total pvalue
Age 28.1 26.8 26.2 26.7 p = 0.01
  SD = 7.7 SD = 7.3 SD = 6.8 7.2  
Ethnicity         
Caucasian 125 80% 34 63% 339 70% 498 p = 0.01
African 31 20% 20 37% 143 30% 194  
Sex         
Male 149 94% 54 98% 465 96% 668 p > 0.05
Female 9 6% 1 2% 21 4% 31  
Education         
primary school or less 92 62% 47 87% 347 73% 486 P = 0.001
secondary school or more 57 38% 7 13% 127 27% 191  
Marriage Status         
single 96 61% 34 62% 289 60% 419 p > 0.05
married/cohabiting 37 23% 15 27% 128 27% 180  
divorced/widowed 25 16% 6 11% 63 13% 94